Q: Is 666,604 a Prime Number?
A: No, 666,604 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 666604 can be evenly divided by 1 2 4 17 34 68 9,803 19,606 39,212 166,651 333,302 and 666,604, with no remainder.
Since 666,604 cannot be divided by just 1 and 666,604, it is not a prime number.