If "2.mkv" is a massive 4K rip (10GB+), you can transcode it into a smaller MP4 using HandBrake to make it playable on mobile devices or older TVs. 4. Organization for Cinephiles If this is part of a collection:
Here is an interesting guide to mastering your "2.mkv" file, from viewing to advanced customization. 1. The "Open Anything" Toolkit
Right-click during playback in VLC to see if multiple tracks are available. Some MKVs have "Forced" subtitles that only show up during foreign language scenes.
The "2" in your filename might indicate a second part or version, but you don't have to guess what's inside.