Q: Is 821,320 a Prime Number?
A: No, 821,320 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 821320 can be evenly divided by 1 2 4 5 8 10 20 40 20,533 41,066 82,132 102,665 164,264 205,330 410,660 and 821,320, with no remainder.
Since 821,320 cannot be divided by just 1 and 821,320, it is not a prime number.