Q: Is 642,731 a Prime Number?
A: No, 642,731 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 642731 can be evenly divided by 1 53 67 181 3,551 9,593 12,127 and 642,731, with no remainder.
Since 642,731 cannot be divided by just 1 and 642,731, it is not a prime number.