Q: Is 321,280 a Prime Number?
A: No, 321,280 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 321280 can be evenly divided by 1 2 4 5 8 10 16 20 32 40 64 80 128 160 251 256 320 502 640 1,004 1,255 1,280 2,008 2,510 4,016 5,020 8,032 10,040 16,064 20,080 32,128 40,160 64,256 80,320 160,640 and 321,280, with no remainder.
Since 321,280 cannot be divided by just 1 and 321,280, it is not a prime number.