Q: Is 666,550 a Prime Number?
A: No, 666,550 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 666550 can be evenly divided by 1 2 5 10 25 50 13,331 26,662 66,655 133,310 333,275 and 666,550, with no remainder.
Since 666,550 cannot be divided by just 1 and 666,550, it is not a prime number.