Classify zero, as a prime or composite
Zero is neither prime nor composite.
Prime numbers are defined as positive integers greater than 1 that have no positive divisors other than 1 and themselves. Since zero is not a positive integer, it does not meet the criteria to be classified as a prime number.
Composite numbers, on the other hand, are positive integers greater than 1 that can be divided evenly by at least one positive divisor other than 1 and themselves. As zero is not a positive integer, it also does not meet the criteria to be classified as a composite number.
Therefore, zero is considered a distinct category known as a "null" or "neutral" number, separate from primes and composites.