Steps followed:
1. take input from user and store in num variable
2. validate user input by converting to integer
3. check if number is 0 or 1, if yes print not prime and terminate. Else divide the number from all numbers from 3 to one less then the number, if any number gives remainder as zero - increase the count
4. If count is 0, the the number is prime else its not a prime number
5. print result

Program

#python program for prime number check

#getting input from user and storing in num variables

num=input("enter a number: ")

#validating user input

try:

    num=int(num)

    print("you have entered valid number")    

    i=2

    count=0

    #0 and 1 are not prime numbers

    if num in (0,1):

        print("%d is not a prime number"%(num))

    else:

        while i<num:

            if num % i == 0:

                count += 1

                i += 1

            else:

                i += 1

        #prime numbers are only divisble by 1 and the number itself        

        if count == 0:

            print("%d is a prime number"%(num))

        else:

            print("%d is not a prime number"%(num))

        

except:

    print("you have entered invalid number")

Output

enter a number: 135

you have entered valid number

135 is not a prime number

 

enter a number: 139

you have entered valid number

139 is a prime number

 

enter a number: counter

you have entered invalid number

► Python program for prime number check