Q: Is 21,720 a Composite Number?

 A: Yes, 21,720 is a composite number.

Why is 21,720 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 21,720 can be evenly divided by 1 2 3 4 5 6 8 10 12 15 20 24 30 40 60 120 181 362 543 724 905 1,086 1,448 1,810 2,172 2,715 3,620 4,344 5,430 7,240 10,860 and 21,720, with no remainder.

Since 21,720 cannot be divided by just 1 and 21,720, it is a composite number.


More Examples

Number 21,71821,71921,72121,722
Composite? yesyesyesyes
  • All positive natural numbers are either a prime number or a composite number (except the number 1, which is neither).

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