Q: Is 638,521 a Prime Number?
A: No, 638,521 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 638521 can be evenly divided by 1 13 49,117 and 638,521, with no remainder.
Since 638,521 cannot be divided by just 1 and 638,521, it is not a prime number.