Q: Is 398,678 a Prime Number?
A: No, 398,678 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 398678 can be evenly divided by 1 2 7 14 28,477 56,954 199,339 and 398,678, with no remainder.
Since 398,678 cannot be divided by just 1 and 398,678, it is not a prime number.