Q: Is 666,670 a Prime Number?
A: No, 666,670 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 666670 can be evenly divided by 1 2 5 10 163 326 409 815 818 1,630 2,045 4,090 66,667 133,334 333,335 and 666,670, with no remainder.
Since 666,670 cannot be divided by just 1 and 666,670, it is not a prime number.