Is it possible to have 2 associated Apple ID or iCloud account on a single device?

Okay so I bought a used or second hand iPhone 5 online. The iCloud account is cleared so I input mine. I decided to perform a hard reset or a restore via iTunes but I fear something might go wrong.

So I'm asking, is it possible to have 2 associated Apple ID or iCloud account on a single device (I mean, does the iCloud account or Apple ID of the previous owner of the device is really gone)? Does my iPhone now recognizes my own iCloud account or Apple ID?

You can use different accounts for different purposes on the phone, although that's not necessarily a good idea. However, if the Activation Lock is set, there's no way to get past it without the help of the original owner. If the seller of the phone didn't reset this before selling the phone, it's probably stolen.

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