Q: Is 421,645 a Prime Number?
A: No, 421,645 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 421645 can be evenly divided by 1 5 7 35 49 245 1,721 8,605 12,047 60,235 84,329 and 421,645, with no remainder.
Since 421,645 cannot be divided by just 1 and 421,645, it is not a prime number.