Is a ryzen 3 3100 4x3.6 GHz suitable for minecraft or not?
Absolutely sufficient for Minecraft Vanilla.
With such a processor you can play Minecraft with shaders and texture packs at 120 fps. So loose should be enough.
Shaders and text packages probably less, because, as far as I know, the graphics unit or graphics card is more stressed than the processor
If you want to buy it, you should probably buy a 3600. If you have an internal graphics unit, a 3400 would work.