Q: Is 21,315 a Composite Number?

 A: Yes, 21,315 is a composite number.

Why is 21,315 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 21,315 can be evenly divided by 1 3 5 7 15 21 29 35 49 87 105 145 147 203 245 435 609 735 1,015 1,421 3,045 4,263 7,105 and 21,315, with no remainder.

Since 21,315 cannot be divided by just 1 and 21,315, it is a composite number.


More Examples

Number 21,31321,31421,31621,317
Composite? noyesyesno
  • All positive natural numbers are either a prime number or a composite number (except the number 1, which is neither).

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