Tip – Find SharePoint Version Number
Give the SharePoint url with “_vti_pvt/service.cnf” which shows the current version of SharePoint site.
In the below example “http://app1:42466” is my SharePoint 2013 dev site
http://app1:42466/_vti_pvt/service.cnf
SharePoint Build Numbers list
https://blogs.technet.microsoft.com/steve_chen/sharepoint-2013-build-numbers-and-cus/#Build
Powershell script to display versions and language packs