Q: Is 420,021 a Prime Number?
A: No, 420,021 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 420021 can be evenly divided by 1 3 7 9 21 59 63 113 177 339 413 531 791 1,017 1,239 2,373 3,717 6,667 7,119 20,001 46,669 60,003 140,007 and 420,021, with no remainder.
Since 420,021 cannot be divided by just 1 and 420,021, it is not a prime number.