program to check if a number is prime or not in python

1# Program to check if a number is prime or not
2
3num = 29
4
5# To take input from the user
6#num = int(input("Enter a number: "))
7
8# define a flag variable
9flag = False
10
11# prime numbers are greater than 1
12if num > 1:
13    # check for factors
14    for i in range(2, num):
15        if (num % i) == 0:
16            # if factor is found, set flag to True
17            flag = True
18            # break out of loop
19            break
20
21# check if flag is True
22if flag:
23    print(num, "is not a prime number")
24else:
25    print(num, "is a prime number")