Q: Is 128,543 a Prime Number?
A: No, 128,543 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 128543 can be evenly divided by 1 191 673 and 128,543, with no remainder.
Since 128,543 cannot be divided by just 1 and 128,543, it is not a prime number.