To find out your Google account login, first go to Gmail. Now click on your photo or Gmail ID on the top right. Here you get to see many options.
You have to go to the Manage Your Google Account section. From here go to the Security option and see the Your Device section. Here you will see a list of all devices with Google Account login.
If you think that any of these is not your device, then you can also log out from here.
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