For two reasons.
1) Prime numbers are defined a integers greater than 1.
2) No Prime number can be even and 0 is an even number.
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Composite
No.
No.
Zero is an even number but it is not composite (nor prime).
a prime number is a number that can only be divided by 1and its self... 1 isnt a prime number but 2, 3, 5, 7, 9, 11 etc... are prime numbers.