Q: Is 643,003 a Prime Number?
A: No, 643,003 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 643003 can be evenly divided by 1 41 15,683 and 643,003, with no remainder.
Since 643,003 cannot be divided by just 1 and 643,003, it is not a prime number.