Q: Is 128,500 a Prime Number?
A: No, 128,500 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 128500 can be evenly divided by 1 2 4 5 10 20 25 50 100 125 250 257 500 514 1,028 1,285 2,570 5,140 6,425 12,850 25,700 32,125 64,250 and 128,500, with no remainder.
Since 128,500 cannot be divided by just 1 and 128,500, it is not a prime number.