Q: Is 398,423 a Prime Number?
A: Yes, 398,423 is a prime number.
A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 398423 can be evenly divided by 1 and 398,423, with no remainder.
Since 398,423 can be divided by just 1 and 398,423, it is a prime number.