I just changed my Apple password but am still receiving uninvited pop ups

Hello, myron40.

It's very unlikely this is a proper virus. I understand there are none of those on the Mac platform.

More likely you've inadvertently installed some sort of ad-ware or other malware.

I recommend that you download and run Malwarebytes.  This application scans for adware and malware and is a popular tool among veteran users here in the Community. See if it can identify any malware you may have accidentally installed. The free version is probably all you need at this point to identify and quarantine potential problems.