Q: Is 821,120 a Prime Number?
A: No, 821,120 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 821120 can be evenly divided by 1 2 4 5 8 10 16 20 32 40 64 80 128 160 320 640 1,283 2,566 5,132 6,415 10,264 12,830 20,528 25,660 41,056 51,320 82,112 102,640 164,224 205,280 410,560 and 821,120, with no remainder.
Since 821,120 cannot be divided by just 1 and 821,120, it is not a prime number.