Q: Is 642,945 a Prime Number?
A: No, 642,945 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 642945 can be evenly divided by 1 3 5 15 42,863 128,589 214,315 and 642,945, with no remainder.
Since 642,945 cannot be divided by just 1 and 642,945, it is not a prime number.