Using an already created primality test for Sum All Primes?

I am currently working on the sum all primes intermediate algorithm. I need to use a primality test for this algorithm and I was wondering if it was considered cheating to use an already created algorithm that checks for primality to work hand in hand in my algorithm?

The only person you can cheat in this curriculum is yourself. If you’re using someone else’s code for checking primality, then you are skipping the more difficult part of this challenge. I would consider it “cheating,” but it’s your call.