What are the numbers that are not prime or composite?

Answer:
A prime number is a number with two positive integer factors, while a composite number has more than two positive integer factors. Since the number 0 has no positive integer factors, and the number 1 has just one positive integer factor (itself), neither of these are prime.
First answer by Alcohen2006. Last edit by Bobo192. Contributor trust: 1089 [recommend contributor recommended]. Question popularity: 1 [recommend question].