Q: Is 628,521 a Prime Number?
A: No, 628,521 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 628521 can be evenly divided by 1 3 23 69 9,109 27,327 209,507 and 628,521, with no remainder.
Since 628,521 cannot be divided by just 1 and 628,521, it is not a prime number.