Q: Is 21,318 a Prime Number?
A: No, 21,318 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 21318 can be evenly divided by 1 2 3 6 11 17 19 22 33 34 38 51 57 66 102 114 187 209 323 374 418 561 627 646 969 1,122 1,254 1,938 3,553 7,106 10,659 and 21,318, with no remainder.
Since 21,318 cannot be divided by just 1 and 21,318, it is not a prime number.