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Identify each number as prime, composite or neither: 1
zero is not prime or compositeIt is neither prime nor composite. See the link.
Start looking for factors; you already know that 1 is a factor, and that the number itself is a second factor (unless the number is 1). As soon as you find a factor that is neither 1 nor the number itself, the number is composite. If you find exactly two factors, the number is prime. If the number has only one factor, the number is 1, which is neither prime nor composite.
Not all numbers are either prime or composite. The number 1/2 is neither prime nor composite. If you are referring only to the natural or counting numbers, note that every natural number is equal to the product of itself and 1 so each number has at least one divisor, itself. If it has no more divisors, then it is prime. If it has more than itself as a divisor, then it is composite.
A composite number has more than two positive integer factors. A prime number has exactly two positive integer factors. 0 is therefore neither prime nor composite. It is not "composed" of any factors.Zero (0) is neither composite nor prime.