Q: Is 331,221 a Prime Number?
A: No, 331,221 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 331221 can be evenly divided by 1 3 11 33 10,037 30,111 110,407 and 331,221, with no remainder.
Since 331,221 cannot be divided by just 1 and 331,221, it is not a prime number.