### Zero cannot be written as product os factors

0 (zero) is not a prime number because it isn't divided by itself. Zero has an infinite number of divisors (any nonzero whole number divides zero). It cannot be written as a product of two factors, neither of which is itself, so zero is also not composite. More concisely, zero is not a prime or a composite number either.

The first prime numbers are: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37

References:

https://en.wikipedia.org/wiki/Table_of_prime_factors

http://coolconversion.com/math/prime-numbers/Is_0_a-prime-number?