Q: Is 243,900,021 a Prime Number?
A: No, 243,900,021 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 243900021 can be evenly divided by 1 3 41 61 123 183 2,501 7,503 32,507 97,521 1,332,787 1,982,927 3,998,361 5,948,781 81,300,007 and 243,900,021, with no remainder.
Since 243,900,021 cannot be divided by just 1 and 243,900,021, it is not a prime number.
| Number | 243,900,019 | 243,900,020 | 243,900,022 | 243,900,023 |
| Prime? | no | no | no | yes |