What are all the numbers that are not prime or composite?

Answer:
The property of prime or composite applies only to integers. All other numbers (non-integer rationals and all irrational numbers) are neither prime nor composite. Within integers, 0 and 1 are neither prime nor composite.
First answer by Mehtamatics. Last edit by Mehtamatics. Contributor trust: 614 [recommend contributor recommended]. Question popularity: 1 [recommend question].