Q: Is 642,608 a Prime Number?
A: No, 642,608 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 642608 can be evenly divided by 1 2 4 8 16 40,163 80,326 160,652 321,304 and 642,608, with no remainder.
Since 642,608 cannot be divided by just 1 and 642,608, it is not a prime number.