Q: Is 123,721 a Prime Number?
A: No, 123,721 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 123721 can be evenly divided by 1 13 31 307 403 3,991 9,517 and 123,721, with no remainder.
Since 123,721 cannot be divided by just 1 and 123,721, it is not a prime number.