Q: Is 421,551 a Prime Number?
A: No, 421,551 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 421551 can be evenly divided by 1 3 9 13 27 39 117 351 1,201 3,603 10,809 15,613 32,427 46,839 140,517 and 421,551, with no remainder.
Since 421,551 cannot be divided by just 1 and 421,551, it is not a prime number.