Q: Is 421,518 a Prime Number?
A: No, 421,518 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 421518 can be evenly divided by 1 2 3 6 163 326 431 489 862 978 1,293 2,586 70,253 140,506 210,759 and 421,518, with no remainder.
Since 421,518 cannot be divided by just 1 and 421,518, it is not a prime number.