Q: Is 421,280 a Prime Number?
A: No, 421,280 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 421280 can be evenly divided by 1 2 4 5 8 10 16 20 32 40 80 160 2,633 5,266 10,532 13,165 21,064 26,330 42,128 52,660 84,256 105,320 210,640 and 421,280, with no remainder.
Since 421,280 cannot be divided by just 1 and 421,280, it is not a prime number.