Q: Is 21,168 a Prime Number?

 A: No, 21,168 is not a prime number.

Why is 21,168 not a prime number?

A prime number is a natural number, greater than one, that can only be divided by 1 and itself.

The number 21168 can be evenly divided by 1 2 3 4 6 7 8 9 12 14 16 18 21 24 27 28 36 42 48 49 54 56 63 72 84 98 108 112 126 144 147 168 189 196 216 252 294 336 378 392 432 441 504 588 756 784 882 1,008 1,176 1,323 1,512 1,764 2,352 2,646 3,024 3,528 5,292 7,056 10,584 and 21,168, with no remainder.

Since 21,168 cannot be divided by just 1 and 21,168, it is not a prime number.


More Examples

Number 21,16621,16721,16921,170
Prime? nonoyesno
  • All positive natural numbers are either a prime number or a composite number (except the number 1, which is neither).

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