Q: Is 421,287 a Prime Number?
A: No, 421,287 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 421287 can be evenly divided by 1 3 19 57 361 389 1,083 1,167 7,391 22,173 140,429 and 421,287, with no remainder.
Since 421,287 cannot be divided by just 1 and 421,287, it is not a prime number.