Q: Is 643,001 a Prime Number?
A: No, 643,001 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 643001 can be evenly divided by 1 61 83 127 5,063 7,747 10,541 and 643,001, with no remainder.
Since 643,001 cannot be divided by just 1 and 643,001, it is not a prime number.