Q: Is 643,265 a Prime Number?
A: No, 643,265 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 643265 can be evenly divided by 1 5 7 35 18,379 91,895 128,653 and 643,265, with no remainder.
Since 643,265 cannot be divided by just 1 and 643,265, it is not a prime number.