Q: Is 42,399 a Prime Number?
A: No, 42,399 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 42399 can be evenly divided by 1 3 7 9 21 63 673 2,019 4,711 6,057 14,133 and 42,399, with no remainder.
Since 42,399 cannot be divided by just 1 and 42,399, it is not a prime number.