Q: Is 21,397,509 a Prime Number?
A: No, 21,397,509 is 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 21397509 can be evenly divided by 1 3 7 9 17 21 51 63 119 153 357 1,071 19,979 59,937 139,853 179,811 339,643 419,559 1,018,929 1,258,677 2,377,501 3,056,787 7,132,503 and 21,397,509, with no remainder.
Since 21,397,509 cannot be divided by just 1 and 21,397,509, it is not a prime number.
| Number | 21,397,507 | 21,397,508 | 21,397,510 | 21,397,511 |
| Prime? | no | no | no | yes |