Q: Is 81,280 a Prime Number?
A: No, 81,280 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 81280 can be evenly divided by 1 2 4 5 8 10 16 20 32 40 64 80 127 128 160 254 320 508 635 640 1,016 1,270 2,032 2,540 4,064 5,080 8,128 10,160 16,256 20,320 40,640 and 81,280, with no remainder.
Since 81,280 cannot be divided by just 1 and 81,280, it is not a prime number.