Q: Is 421,728 a Prime Number?
A: No, 421,728 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 421728 can be evenly divided by 1 2 3 4 6 8 12 16 23 24 32 46 48 69 92 96 138 184 191 276 368 382 552 573 736 764 1,104 1,146 1,528 2,208 2,292 3,056 4,393 4,584 6,112 8,786 9,168 13,179 17,572 18,336 26,358 35,144 52,716 70,288 105,432 140,576 210,864 and 421,728, with no remainder.
Since 421,728 cannot be divided by just 1 and 421,728, it is not a prime number.