Q: Is 21,307 a Prime Number?
A: No, 21,307 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 21307 can be evenly divided by 1 11 13 143 149 1,639 1,937 and 21,307, with no remainder.
Since 21,307 cannot be divided by just 1 and 21,307, it is not a prime number.