Q: Is 399,009 a Prime Number?
A: No, 399,009 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 399009 can be evenly divided by 1 3 13 39 169 507 787 2,361 10,231 30,693 133,003 and 399,009, with no remainder.
Since 399,009 cannot be divided by just 1 and 399,009, it is not a prime number.