A whole number that can be made by multiplying other whole numbers.
Example: 6 can be made by 2 × 3 so is a composite number.
But 7 can not be made by multiplying other whole numbers (1×7 would work, but we said to use other whole numbers) so 7 is not a composite number, it is a prime number.
All whole numbers above 1 are either composite or prime.
See: Prime Number