Q: Is 399,389 a Prime Number?
A: Yes, 399,389 is a prime number.
A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 399389 can be evenly divided by 1 and 399,389, with no remainder.
Since 399,389 can be divided by just 1 and 399,389, it is a prime number.