Q: Is 399,942 a Prime Number?
A: No, 399,942 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 399942 can be evenly divided by 1 2 3 6 9 17 18 34 51 102 153 306 1,307 2,614 3,921 7,842 11,763 22,219 23,526 44,438 66,657 133,314 199,971 and 399,942, with no remainder.
Since 399,942 cannot be divided by just 1 and 399,942, it is not a prime number.