Q: Is 720,666 a Prime Number?
A: No, 720,666 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 720666 can be evenly divided by 1 2 3 6 9 18 40,037 80,074 120,111 240,222 360,333 and 720,666, with no remainder.
Since 720,666 cannot be divided by just 1 and 720,666, it is not a prime number.