Q: Is 398,740 a Prime Number?
A: No, 398,740 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 398740 can be evenly divided by 1 2 4 5 10 20 19,937 39,874 79,748 99,685 199,370 and 398,740, with no remainder.
Since 398,740 cannot be divided by just 1 and 398,740, it is not a prime number.