prime number

a prime number has exactly two positive divisors itself and one .
1)now  is the number zero is a prime number ?
no because the zero divisible by any nonzero number so it has an infinite numbers of divisors
2) is the number one is a prime number ?
no because the number one has one positive divisor is itself
3) is the number two a prime number ?
yes because the number two divisible by one and it self so it has two divisors one and it self and the number two is the only even prime number
so we can define the prime number as it greater than one and has no divisors other than one and itself