Q: Is 666,608 a Prime Number?
A: No, 666,608 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 666608 can be evenly divided by 1 2 4 8 16 61 122 244 488 683 976 1,366 2,732 5,464 10,928 41,663 83,326 166,652 333,304 and 666,608, with no remainder.
Since 666,608 cannot be divided by just 1 and 666,608, it is not a prime number.