Is  1  considered a prime number ?
144715
i say no because 1 can only divide by NOT'ING but 1
93973
A composite number n is a positive integer 1 which is not prime (i.e., which has factors other than 1 and itself). The first few composite numbers (sometimes called "composites" for short) are 4, 6, 8, 9, 10, 12, 14, 15, 16, ... (Sloane's A002808), which can be written 2^2, 2.3, 2^3, 3^2, 2.5, 2^2.3, 2.7, 3.5, and 2^4, respectively. The number 1 is a special case which is considered to be neither composite nor prime.
65054
101 (b) is a prime number because it can't be divided (without leaving a remainder) by anything, except itself and 1.
22019
today we don't have practical to find all prime number. you can find a part of them through Mersenne number: 2^p-1 or Fermat number: 2^(2^n) with p is prime number and n is nature number
357003
if you take the number N and add one it must be prime... \n\ntake any number it can be writen as a product of primes, so in this case let us just examin N+1/p_j\n\nclearly N/p_j is an integer, and 1/p_j is clearly not an integer. \n\nSo if N were not prime then there would exist p_j such that N+1/p_j was an integer.   But that can not be true, therefore the assumption that there are only finitly many primes is incorrect, and the opposite is true, there are infinitly many primes QED
645443
Primes less than 100:\n2\n3\n5\n7\n11\n13\n17\n19\n23\n29\n31\n37\n41\n43\n47\n53\n59\n61\n67\n71\n73\n79\n83\n89\n97\n\nFrom this list we keep only:\n3\n7\n13\n17\n23\n31\n37\n43\n47\n53\n67\n71\n73\n79\n83\n97\n\nGood luck...
653675
Yes.  If you assume there are a finite number prime numbers, then a list of them would look like a1, a2, ..., an.  If you can make this number...\n\n(a1)(a2)(a3)...(an) + 1\n\n...then dividing this number by any of the known primes, you would have a remainder of 1, so therefore this number is a prime.  This is a contradiction that the primes are finite, so the primes must be infinite.
436162
no it is not\nhere is a list\n\n2, 3, 5, 7, 11, 13, 17, 19, 23, 29,\n31, 37, 41, 43, 47, 53, 59, 61, 67, 71\n73, 79, 83, 89, 97, 101, 103, 107, 109, 113,\n127, 131, 137, 139, 149, 151, 157, 163, 167, 173,\n179, 181, 191, 193, 197, 199, 211, 223, 227, 229,\n233, 239, 241, 251, 257, 263, 269, 271, 277, 281,\n283, 293. \n\n\n\nhow did I find out?  google?  prime numbers between 100 and 200
246941
5, you are listing the prime numbers
175248
Unfortunately I don't know of a quick method but I can help you a little here. \n\nFirst, as you probably already know, prime numbers can only be evenly divided by 1 and the number itself.\n\nSecond, since all numbers are a product of prime numbers you can save time in by not testing division by non-prime numbers like 4 and 6 and 9 and so on.\n\nThird, you only have to test those prime number that are smaller than the square root of the number.\n\nIn your example, 117, you need only test the prime numbers less than 10.81.... since that is the square root of 117. So do a trial divide of 117 by 2, 3, 5, and 7.\n\nOf course there are a few other rules that can help you eliminate the first three choices. If the number is odd, it can't be evenly divided by 2. If the sum of digits isn't divisible by 3 then the number isn't either. And all numbers that are divisible by 5 end in 5 or zero.\n\nFor 117, the number is odd so that eliminates 2. The sum of 1 and 1 and 7 is 9 which is divisible by 3 so 117 is divisible by three and therefore not prime.\n\nSo now you may notice that 117 is divisible by 3 and 39 but I said you only need to test numbers smaller than the square root. What about 39? Well, since the number is divisible by three that alone proves the number is not prime. If you want the full prime factorization, you need to keep dividing.\n\nGood luck.
465400
2, 3, 5, 7, 11\n28\n\nFYI- 1 is not a prime number! It is only divisible by 1. To be a prime number, it must be divisible by 2 numbers.\n\nprime numbers up to 20-\n2, 3, 5, 7, 11, 13, 17, 19\n\nto find a prime number, start at the number 2. cross out every other number (that would be 4, 6, 8, even numbers). Then cross out every 3rd number, every 4th number, and so on. The remaining numbers are prime!\n\nHope this helps!
774603
There are too many to list....you can find the first 1000 here:\nhttp://en.wikipedia.org/wiki/List_of_prime_numbers\n\n\nHere are some:[edit] The first thousand prime numbers\n2 3 5 7 11 13 17 19 23 29 \n31 37 41 43 47 53 59 61 67 71 \n73 79 83 89 97 101 103 107 109 113 \n127 131 137 139 149 151 157 163 167 173 \n179 181 191 193 197 199 211 223 227 229 \n233 239 241 251 257 263 269 271 277 281 \n283 293 307 311 313 317 331 337 347 349 \n353 359 367 373 379 383 389 397 401 409 \n419 421 431 433 439 443 449 457 461 463 \n467 479 487 491 499 503 509 521 523 541 \n547 557 563 569 571 577 587 593 599 601 \n607 613 617 619 631 641 643 647 653 659 \n661 673 677 683 691 701 709 719 727 733 \n739 743 751 757 761 769 773 787 797 809 \n811 821 823 827 829 839 853 857 859 863
1133242
a number which can be divided evenly only by itself and 1...\n\n"...in mathematics, a prime number (or a prime) is a natural number greater than one whose only positive divisors are one and itself. Said another way, a prime number can only be divided into equally by 1 and itself (3 is a prime number because 1 goes into it equally 3 times and 3 goes into it equally once, there is no remainder.) A natural number that is greater than one and is not a prime is called a composite number. The numbers zero and one are neither prime nor composite. The property of being a prime is called primality. Since 2 is the only even prime number, the term odd prime refers to all prime numbers greater than 2. Prime numbers are of course of prime importance in number theory.\n\nThe sequence of prime numbers begins as follows:\n\n2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, ... \n\n2 is the only even prime number "
899443
39 can be devided by 3 people.  Scary.  \n\nBut you get the jist of what is a prime and a square from the other posts.
1061835
Th next number is 18. It is going up by the first prime number, down by the second prime number, up by the third prime number, down by the fourth, up by the fifth, and down by the sixth. So the last number is up by the seventh prime number.
583419
yes..http://primes.utm.edu/curios/page.php/101.html
231634
well i am trying to find out myself\n\n31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97.\n\nthat makes 15\n\n2, 3, 5, 7, 11, 13, 17, 19, 23, 29.\n\nthats 10\n\nU have all 25 prime less than 100 !\n\nAlways remember 1 is not a prime number ! cuz its divisible only by 1 and not any other number. and prime number requires divisibility by 1 and the number itself. i hope u got everything !\n\nmodified....i messed up somewhat. i wrote 65 and forgot 71. its clear now im sure watever i've writeen is 100% correct.