Calculate multiply of prime digits in a number

Question

I'm trying to write a method that returns the product of prime digits in a number.

I got stuck after the for loop. I don't know how to multiply all the prime numbers. any help?

An example of the function: The number 124563 has three prime digits: 2, 5, 3, and the product of these three numbers is 30. So my method should return 30 when supplied with 124563.

enter image description here

Welcome to Stack Overflow! Please avoid posting images (or worse, links to images) of code or errors. Anything text-based (code and errors) should be posted as text directly in the question itself and formatted properly as a [mre]. You can get more [formatting help here](https://stackoverflow.com/help/formatting). You can also read about [why you shouldn't post images/links of code](//meta.stackoverflow.com/q/285551). — Tomerikoo, Nov 01 '21 at 20:48
[idownvotedbecau.se/imageofcode](https://idownvotedbecau.se/imageofcode). Add each number which is prime, to a list (`append`) and then calculate the product. Your code doesn't even have a prime number check or a prime number list. — aneroid, Nov 01 '21 at 20:48
Your question is a multi-duplicate that can be answered by following this: First [Iterate over digits of number](https://stackoverflow.com/q/28268196/6045800), then [Checking if a number is a prime number in Python (duplicate)](https://stackoverflow.com/q/4114167/6045800) and add it to a list. Then, [How can I multiply all items in a list together with Python?](https://stackoverflow.com/q/13840379/6045800) — Tomerikoo, Nov 01 '21 at 20:51

score 0 · Answer 1 · answered Nov 01 '21 at 21:08

See if this helps:

def productPrime(num):

    result = 1
    
    prime_numbers = [2,3,5,7] ## since you want to multiply only prime digits otherwise you need to write a code to check prime number
    
    while num > 0:
        if (num % 10) in prime_numbers:
            result = result*(num % 10)
        num = num//10
        
    if result != 1:
        return result
    else:
        return ("No prime digit in number")

Calculate multiply of prime digits in a number

1 Answers1