Q: Is 400,389 a Prime Number?
A: No, 400,389 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 400389 can be evenly divided by 1 3 11 33 121 363 1,103 3,309 12,133 36,399 133,463 and 400,389, with no remainder.
Since 400,389 cannot be divided by just 1 and 400,389, it is not a prime number.