Q: Is 687,428 a Prime Number?
A: No, 687,428 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 687428 can be evenly divided by 1 2 4 7 14 28 24,551 49,102 98,204 171,857 343,714 and 687,428, with no remainder.
Since 687,428 cannot be divided by just 1 and 687,428, it is not a prime number.