Q: Is 421,420 a Prime Number?
A: No, 421,420 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 421420 can be evenly divided by 1 2 4 5 10 19 20 38 76 95 190 380 1,109 2,218 4,436 5,545 11,090 21,071 22,180 42,142 84,284 105,355 210,710 and 421,420, with no remainder.
Since 421,420 cannot be divided by just 1 and 421,420, it is not a prime number.