Where can I find the EPSG code of a Feature Class?
Browse your feature class in
ArcCatalog -> Properties -> XY Coordinate System, as you can see below:
When you load the feature class into the table of content (TOC), right-click the in the view and go to
Data Frame Properties -> Coordinate System and you will find it there. Or you can go to the
Layers (in the TOC)-> Properties -> Coordinate System as you can see below: