Jira uses port 8080 and crowd uses 8095. The server.xml is where you change the port and it is located in your JIRA installation's conf folder.
For example. C:\Program Files\Atlassian\JIRA\conf\server.xml
To change the port, take a look at this doc
No, JIRA has it's own internal authentication system. Crowd is our SSO option for Atlassian products. You can make use of Crowd to authentication your users across all Atlassian products installations.
Please take a look at https://www.atlassian.com/software/crowd/overview
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