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www.reference.com/article/1-prime-number-d0c22610f491fbc4

The number 1 is not a prime number. A prime number by definition is a positive integer greater than 1 that is evenly divisible by only itself and 1.

www.reference.com/article/two-prime-number-e424a94a55b2cf3a

Two is a prime number. Two is the smallest prime number and the only even prime number, since all other even numbers divide by two.

www.reference.com/article/2-prime-number-c4622f275383f243

Yes, 2 is a prime number. In fact, 2 is the only even number that is prime. A prime number is a number that has only two factors, the number 1 and itself.

www.reference.com/article/9-prime-number-c00180ebaaec359b

Nine is not a prime number. It is a composite number, because it has more than two factors. A prime number is only divisible by one and by itself, and nine is divisible by one and by nine, but it is also divisible by the number three.

www.reference.com/article/0-prime-number-1964bd6272594f3f

The number zero is not a prime number. By definition, a prime number dictates that the number must be a whole number greater in value than one and must be divisible by only itself and one.

www.reference.com/article/19-prime-number-fda5f29d99e14071

The number 19 is the eighth prime number. A prime number is a positive, whole number that is only divisible by one and itself. Nineteen is also the seventh Mersenne prime exponent, which is a prime number that is one less than a power of two.

www.reference.com/article/one-prime-number-4c916ba7da91e2fa

One is not a prime number because the definition of a prime number is any number that is greater than one that is only divisible by one and itself. Since one is of course not greater than one, it does not fit the definition of a prime number.

www.reference.com/article/factor-tree-e5d9446ea6487262

A factor tree is a diagram that shows the breakdown of a number into its prime factors. This diagram holds a pattern similar to a family tree, with a line between each factor and its factors.