Q: Is 638,857 a Prime Number?
A: Yes, 638,857 is a prime number.
A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 638857 can be evenly divided by 1 and 638,857, with no remainder.
Since 638,857 can be divided by just 1 and 638,857, it is a prime number.