Q: Is 399,428 a Prime Number?
A: No, 399,428 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 399428 can be evenly divided by 1 2 4 61 122 244 1,637 3,274 6,548 99,857 199,714 and 399,428, with no remainder.
Since 399,428 cannot be divided by just 1 and 399,428, it is not a prime number.