Q: Is 18,221 a Prime Number?
A: No, 18,221 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 18221 can be evenly divided by 1 7 19 133 137 959 2,603 and 18,221, with no remainder.
Since 18,221 cannot be divided by just 1 and 18,221, it is not a prime number.