No it ain't. This is the previous " Pro " version and have more then just the very basic software update feature thats included in the Free version. More information here :It seems to be the simplest Heimdal version.
Yes, You can use it with other Security products. I btw deleted it after 10 minutes.Is it good to use than other security products
It changing DNS adres i noticed (Zemana scan).more or less a combo of DNS filter and Web monitor. Isn't it ?
IMO, premium version is a de facto AV.