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1 is not prime or composite because first, prime numbers are divisible by 1 and itself so 1 is itself and that is only one number. It is not composite because it only has one factor, itself.

0 is not prime or composite because it has an infinite number of divisors because any whole number that isn't 0 divides 0. It can't be written as two numbers so it can't be prime and for that same reason it can't even be composite.

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8y ago

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The concept of prime or composite is defined only for integers larger than 1.

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8y ago
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Q: Why is 1 or 0 not composite or prime?
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