Happy Memorial weekend. My name is ***** ***** is a pleasure to help you with this question.
It appears to be a print. To determine if it a lithographic print or an offset I need you to look at it with a magnifying glass. If you see see a pattern of small dots it is an offset. If it looks like the colors overlap a little the it is a lithograph.
I will check for you.
In order to find out I have to look at his body of work which is extensive. But if you want a quick opinion it appears to be in the style of Peter Max rather than by Peter Max.