Just try this very fast method just request internet connection (as you reading this page).
Go play store and find “Snapdragon™ BatteryGuru”
Or just click link below:
If you see the bad sentence “This app is incompatible with all of your devices.”
Then it means you have Exynos CPU on your phone.
If you can install it, yes you have Snapdragon CPU on your phone 🙂