Can I install another postgresql version in my server

I am a newbie using Gitlab until now so far so good. My question is , I use postgresql in the server that I am using for GitLab but I am seeing that it installed postgresql but it is not using the regular port 5432 for this, Can I install normally my postgresql version for my applications even it has installed another version installed but I dont know how to use this version.
My GitLab version is CE
Thks In Advance