Apple ID
How can I find out how many, and which, apple IDs have been connected to my phone?
iPhone 7, iOS 15
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In general only one ID can be signed in on a phoneat any one time (there is no official list of others who have signed in on that device in the past) but a few services let you sign in with a different ID. It isn't others 'connecting to', rather it is you on the phone signing into certain services with a different ID. Even with a service such as Screen Time, this has to be set up with the knowledge of the device owner.
At this stage it would be good to know if you have a specific concern you have not outlined. Some behaviors are normal and can be explained. If you are concerned about security on your account then here are some things to read:
Click on this link "If you think your Apple ID has been compromised" --> If you think your Apple ID has been compromised - Apple Support
For iOS 15 or earlier, if you want to see if anyone else has access to your device or accounts, click here --> See who has access to your iPhone or iPad - Apple Support
Related materials:
Personal Safety User Guide
Personal Safety User Guide - Apple Support
> open the Table of Contents
A document with general information about security and your Apple ID --> Security and your Apple ID - Apple Support