Q: Is 81,680 a Prime Number?
A: No, 81,680 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 81680 can be evenly divided by 1 2 4 5 8 10 16 20 40 80 1,021 2,042 4,084 5,105 8,168 10,210 16,336 20,420 40,840 and 81,680, with no remainder.
Since 81,680 cannot be divided by just 1 and 81,680, it is not a prime number.