it's zero, not always counted as a number
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Zero is not considered a Prime number because it does not have any factors other than itself, which is a prerequisite for a number to be considered prime. Additionally, zero is not considered a composite number because it does not have more than one factor, which is another requirement for a number to be classified as composite. Zero is a special case and is treated as its own separate category.
One and zero, respectively.
Zero is neither prime or composite but it is an even number because it is between 2 odd numbers which are -1 and +1
There is no name for numbers which are neither prime nor composite.
Zero and one are neither composite nor prime.
Prime numbers have two factors. Composite have more than two. Neither (one and zero) have less than two.