Q: Is 21,131 a Prime Number?
A: No, 21,131 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 21131 can be evenly divided by 1 11 17 113 187 1,243 1,921 and 21,131, with no remainder.
Since 21,131 cannot be divided by just 1 and 21,131, it is not a prime number.