Q: Is 21,128,009 a Composite Number?

Why is 21,128,009 a composite number?

A composite number is a number that can be divided evenly by more numbers than 1 and itself. It is the opposite of a prime number.

The number 21,128,009 can be evenly divided by 1 7 577 4,039 5,231 36,617 3,018,287 and 21,128,009, with no remainder.

Since 21,128,009 cannot be divided by just 1 and 21,128,009, it is a composite number.

More Examples

• All positive natural numbers are either a prime number or a composite number (except the number 1, which is neither).