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### mathslover says

Prime numbers are numbers which have only two factors one at itself. Some prime numbers are 2, 3, 5, 7, 11, 13 ..... The factors of 2 are 1 and 2, factors of 3 are 1 and 3 etc

### NJ's Ponderings says

Just like the others stated, a prime number is a natural number divided evenly by itself and another number, specifically 1 and another natural number. For prime numbers from 1 to 100, they are...2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97.

Hope that helps. :)

### speedbird says

Prime numbers are integers that are greater than 1 and are only divisible by themselves and 1.

### vettergt says

1 is not prime because it only has 1 whole number factor. Most definitions of prime numbers include only positive numbers, however in the algebra class I teach we write the prime factorization of negative numbers in which -1 is the only negative prime number. For instance, the prime factorization of -10 is -1x2x5.

-1 has only two factors -1 and 1 so it does fit the definition for being prime.

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