Q: Is 421,647 a Prime Number?
A: No, 421,647 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 421647 can be evenly divided by 1 3 140,549 and 421,647, with no remainder.
Since 421,647 cannot be divided by just 1 and 421,647, it is not a prime number.