Q: Is 399,421 a Prime Number?
A: No, 399,421 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 399421 can be evenly divided by 1 11 121 3,301 36,311 and 399,421, with no remainder.
Since 399,421 cannot be divided by just 1 and 399,421, it is not a prime number.