A non-zero integer with at least one non-trivial divisor is known as a composite number , while the units − 1 and 1 and prime numbers have no non-trivial divisors .
A divisor of n that is not 1 , -1 , n or - n is known as a non-trivial divisor ; numbers with non-trivial divisors are known as composite numbers , while prime numbers have no non-trivial divisors .