Snapdragon or Exynos?
Install AIDA64 from the Play Store, which is free (with advertising). The CPU tab will show you exactly what SoC you have, and what the cores are. For example, my Samsung Galaxy S8 shows:
SoC Model  Samsung Eyxnos 9 Octa (8895)
Core Architecture 4x ARM Cortex-A53 @ 1690 MHz 4x Samsung Exymos M2 @ 2314 MHz