Q: Is 646,428 a Prime Number?
A: No, 646,428 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 646428 can be evenly divided by 1 2 3 4 6 12 103 206 309 412 523 618 1,046 1,236 1,569 2,092 3,138 6,276 53,869 107,738 161,607 215,476 323,214 and 646,428, with no remainder.
Since 646,428 cannot be divided by just 1 and 646,428, it is not a prime number.