Can a predatory journal have a quite high Impact factor?
Yes it can.* That's because the two things are orthogonal. The asterisk is because you need to define &quot;predatory&quot;, and different people often have different definitions. Still, most definitions are orthogonal to what an impact factor looks at.
The impact factor is calculated by a company called Clarivate. It depends on the number of citations articles published in the journal have received in the past two years, divided by the number of citable articles published. In other words, it depends only on the number of citations received. That means all other considerations that routinely show up when discussing predatory journals, such as the APCs they charge or who they have on the editorial board, are irrelevant.
So yes, it is possible. Caveat: if you believe that the distinguishing hallmark of predatory journals is accepting articles quickly with little or no peer review or quality control, then having an impact factor practically proves the journal isn't predatory. Journals with no quality control are not likely to be indexed by Clarivate in the first place.