Q: Is 643,843 a Prime Number?
A: No, 643,843 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 643843 can be evenly divided by 1 659 977 and 643,843, with no remainder.
Since 643,843 cannot be divided by just 1 and 643,843, it is not a prime number.