Q: Is 666,664 a Prime Number?
A: No, 666,664 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 666664 can be evenly divided by 1 2 4 8 167 334 499 668 998 1,336 1,996 3,992 83,333 166,666 333,332 and 666,664, with no remainder.
Since 666,664 cannot be divided by just 1 and 666,664, it is not a prime number.