I have a Hp Laptop (Pentium, By default comes with a 4GB RAM) The System Model is HP 250 G2 NoteBook PC
Can this pc be upgradable to 16GB RAM?
Looking at the spec sheet for that HP model it looks like you can. (https://support.hp.com/si-en/document/c04044564#AbT2)
Upgradeable to 16384MB with optional 8192MB SODIMMs in slots 1 and 2
RAM type this board takes is DDR3L SDRAM (1600 MHz)
Another way of finding this information out is using Crucial's (Memory supplier) scanning tool;