Received a pop up request to change my unlock password within 60 mins. I did this. Now concerned this was not a legitimate request from Apple. Has my phone been hacked?

Very likely. Pop up requests to change passwords are always suspicious. Was the password for your service supplier or an Apple matter? Have you had problems with it? Was the request addressed to you using your proper name?

If you followed the instructions in this very likely scam message, you have probably provided the scammers with your login credentials. You should change your Apple ID password at https://appleid.apple.com/account/manage - as well as any other site where you use the same password. (This is equivalent to my password having been hacked from a service a couple of weeks ago - I spent half a day changing passwords!)

Certainly a scam. You should never respond to such requests.

As provided, you have given your info to someone with less then stellar intentions.

If you mean your screen slide to unlock passcode and all you did was changed it in settings, then you haven't given anything away to anybody. Nobody can see your device's settings nor monitor you changing them.

Do you have an employer security profile on your decide? MS Exchange profiles can be used to enforce passcode timeouts and prompt you to,change them periodically. Or if you are enrolled in any MDM deployed software, the MDM profile can generate that popup.

nobody including Apple can remotely enforce a change to your slide to unlock passcode. That can only be done from a locally installed security profile.