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