Q: Is 157,221 a Prime Number?
A: No, 157,221 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 157221 can be evenly divided by 1 3 9 27 81 243 647 1,941 5,823 17,469 52,407 and 157,221, with no remainder.
Since 157,221 cannot be divided by just 1 and 157,221, it is not a prime number.