Q: Is 666,609 a Prime Number?
A: No, 666,609 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 666609 can be evenly divided by 1 3 23 69 9,661 28,983 222,203 and 666,609, with no remainder.
Since 666,609 cannot be divided by just 1 and 666,609, it is not a prime number.