12345678910111213141516171819202122232425262728293031323334353637383940 ``````# Copyright (C) 2020, 2019 Girish M # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, # MA 02110-1301, USA. # ''' Ask the user for a number and determine whether the number is prime or not. ''' import math n = int(input('enter a number: ')) prime = True if n%2 == 0 and n != 2: print('composite because it is even and not two') prime = False if n%2 != 0: sq = int(math.sqrt(n)) for factor in range(3, sq): if n%factor == 0: print('composite, because', factor, 'is a factor of', n) prime = False break if prime == True: print('prime') ``````