About This prime detector is made based on the Algorithm.txt file that I added in prime_2 repository. Using Guide For using code you have to inter your number after main.py in terminal or console with space between like: main.py <your number> => main.py 13 => The output is '<number> is prime!!!!' or like: main.py 10 => The output is 'number is NOT prime by factor of <factor>' *Notice* This code is Not too efficient to calculate big numbers. You can use is_prime function in Numpy package that is more efficient. I hope this will be helpful for you. Push limits!