Q: Is 643,129 a Prime Number?
A: Yes, 643,129 is a prime number.
A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 643129 can be evenly divided by 1 and 643,129, with no remainder.
Since 643,129 can be divided by just 1 and 643,129, it is a prime number.