Q: Is 643,395 a Prime Number?
A: No, 643,395 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 643395 can be evenly divided by 1 3 5 15 59 177 295 727 885 2,181 3,635 10,905 42,893 128,679 214,465 and 643,395, with no remainder.
Since 643,395 cannot be divided by just 1 and 643,395, it is not a prime number.