Q: Is 421,557 a Prime Number?
A: No, 421,557 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 421557 can be evenly divided by 1 3 83 249 1,693 5,079 140,519 and 421,557, with no remainder.
Since 421,557 cannot be divided by just 1 and 421,557, it is not a prime number.