Q: Is 21,901 a Prime Number?
A: No, 21,901 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 21901 can be evenly divided by 1 11 121 181 1,991 and 21,901, with no remainder.
Since 21,901 cannot be divided by just 1 and 21,901, it is not a prime number.