Q: Is 21,945 a Composite Number?

 A: Yes, 21,945 is a composite number.

Why is 21,945 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 21,945 can be evenly divided by 1 3 5 7 11 15 19 21 33 35 55 57 77 95 105 133 165 209 231 285 385 399 627 665 1,045 1,155 1,463 1,995 3,135 4,389 7,315 and 21,945, with no remainder.

Since 21,945 cannot be divided by just 1 and 21,945, it is a composite number.


More Examples

Number 21,94321,94421,94621,947
Composite? noyesyesyes
  • All positive natural numbers are either a prime number or a composite number (except the number 1, which is neither).

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