Q: Is 421,278 a Prime Number?
A: No, 421,278 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 421278 can be evenly divided by 1 2 3 6 11 13 22 26 33 39 66 78 143 286 429 491 858 982 1,473 2,946 5,401 6,383 10,802 12,766 16,203 19,149 32,406 38,298 70,213 140,426 210,639 and 421,278, with no remainder.
Since 421,278 cannot be divided by just 1 and 421,278, it is not a prime number.