Calling PragerU propaganda is like calling an Western history book written by a religious person contraband. What exact points do you take umbrage with or is this just a signal to your political preference?
> Propaganda is communication that is primarily used to influence an audience and further an agenda, which may not be objective and may be selectively presenting facts to encourage a particular synthesis or perception, or using loaded language to produce an emotional rather than a rational response to the information that is being presented.[1]
PragerU's "About Us" Page:
> Prager University is the world's leading conservative nonprofit that is focused on changing minds through the creative use of digital media. Taking full advantage of today's technology and social media, we educate millions of Americans and young people about the values that make America great.[2]
I'd also encourage you to check out their "What is PragerU"[3] brochure (PDF) which goes into more detail.
PragerU is the one funding advertisements with wild, baseless, and often scientifically dishonest "research". I don't recall traditional universities doing this. They firmly market themselves as "conservative intellectuals", telling you the "real truth" liberals won't recognize. I'd call that propaganda by definition.