You can use this online tool to convert between coordinate systems: https://mygeodata.cloud/cs2cs/
If you have the time, and absolutely no metadata (data about your data) then you could set the source to WGS84 and input the coordinates you have above and then go through a few target coordinate systems until you find one that matches.
To answer your other questions, you really need to study up on a bit of reference material.
The 'Zone' for a Universal Transverse Mercator projection UTM is a section of the world, divided vertically, (running from equator to pole, hence N or S for north and south). The way UTM works, distance gets distorted after a while, so it's divided into zones that minimise this. See: https://en.wikipedia.org/wiki/Universal_Transverse_Mercator_coordinate_system
To answer your actual questions, in order to read those coordinates, you need to know the coordinate reference system they are defined in. Once you know this, you can use a variety of 'reprojection' or 'transformation' tools to change the coordinates from that one coordinate reference system to a new one, say, WGS84 in Latitude/Longitude.