Q: Is 421,421 a Prime Number?
A: No, 421,421 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 421421 can be evenly divided by 1 7 11 13 77 91 143 421 1,001 2,947 4,631 5,473 32,417 38,311 60,203 and 421,421, with no remainder.
Since 421,421 cannot be divided by just 1 and 421,421, it is not a prime number.