Q: Is 642,637 a Prime Number?
A: No, 642,637 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 642637 can be evenly divided by 1 19 149 227 2,831 4,313 33,823 and 642,637, with no remainder.
Since 642,637 cannot be divided by just 1 and 642,637, it is not a prime number.