Q: Is 21,917 a Prime Number?
A: No, 21,917 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 21917 can be evenly divided by 1 7 31 101 217 707 3,131 and 21,917, with no remainder.
Since 21,917 cannot be divided by just 1 and 21,917, it is not a prime number.