Q: Is 21,000,018 a Prime Number?
A: No, 21,000,018 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 21000018 can be evenly divided by 1 2 3 6 13 26 39 78 269,231 538,462 807,693 1,615,386 3,500,003 7,000,006 10,500,009 and 21,000,018, with no remainder.
Since 21,000,018 cannot be divided by just 1 and 21,000,018, it is not a prime number.
| Number | 21,000,016 | 21,000,017 | 21,000,019 | 21,000,020 |
| Prime? | no | no | no | no |