If you are a C++ developer, download (free for individuals, open-source, and small teams).
Yes. The version number 14.0 corresponds directly to Visual Studio 2015. However, later toolsets (14.29, 14.38, etc.) are binary-compatible with 14.0.
Multiple Versions: It is perfectly normal to see dozens of versions (2005, 2008, 2010, 2012, 2013, etc.) in your programs list. Do not uninstall the old ones, as older apps rely on those specific versions.