Q: Is 20,800 a Prime Number?
A: No, 20,800 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 20800 can be evenly divided by 1 2 4 5 8 10 13 16 20 25 26 32 40 50 52 64 65 80 100 104 130 160 200 208 260 320 325 400 416 520 650 800 832 1,040 1,300 1,600 2,080 2,600 4,160 5,200 10,400 and 20,800, with no remainder.
Since 20,800 cannot be divided by just 1 and 20,800, it is not a prime number.