Q: Is 646,521 a Prime Number?
A: No, 646,521 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 646521 can be evenly divided by 1 3 215,507 and 646,521, with no remainder.
Since 646,521 cannot be divided by just 1 and 646,521, it is not a prime number.