Q: Is 646,221 a Prime Number?
A: No, 646,221 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 646221 can be evenly divided by 1 3 17 51 12,671 38,013 215,407 and 646,221, with no remainder.
Since 646,221 cannot be divided by just 1 and 646,221, it is not a prime number.