From The Document Foundation Wiki
How to find out the version number information for LibreOffice?
To get the LibreOffice version number :
- Select the ▸ menu.
- The number shows in the dialog box.
- The numbering begins from the 3.3.0 of OpenOffice.org, version from which LibreOffice was created.
- The 4th number of the tag is the RC number.
- The build number matches the number of public versions that have existed including development, betas and RCs.