Q: Is 421,617 a Prime Number?
A: No, 421,617 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 421617 can be evenly divided by 1 3 7 17 21 51 119 357 1,181 3,543 8,267 20,077 24,801 60,231 140,539 and 421,617, with no remainder.
Since 421,617 cannot be divided by just 1 and 421,617, it is not a prime number.