Q: Is 21,870 a Composite Number?

 A: Yes, 21,870 is a composite number.

Why is 21,870 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 21,870 can be evenly divided by 1 2 3 5 6 9 10 15 18 27 30 45 54 81 90 135 162 243 270 405 486 729 810 1,215 1,458 2,187 2,430 3,645 4,374 7,290 10,935 and 21,870, with no remainder.

Since 21,870 cannot be divided by just 1 and 21,870, it is a composite number.


More Examples

Number 21,86821,86921,87121,872
Composite? yesyesnoyes
  • All positive natural numbers are either a prime number or a composite number (except the number 1, which is neither).

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