What are the non composite and prime numbers?

All the numbers greater than 1 - they are either

• prime (2, 3, 5, 7, 11, 13, 17, 19, ...); or
• composite (4, 6, 8, 9, 10, 12, 14, 15, ...)

The number 1 is neither prime nor composite. it is often called a Unit.