"I just learned it now."
Yes, this is the verb 知る. It means 'to know' when in the familiar -te iru form 知っている, which for this verb should be thought of as stative rather than progressive (also called continuous). In the non-past or past, however, it means 'to come to know,' 'to find out (about),' 'to learn (of/about).' You probably would have been less confused if they had used either 'about' or 'of' after the verb. This kind of experiential, discovery, or investigative learning stands in contrast with the classroom or personal study kind of learning, for which we could use 学ぶ, 習う, or 勉強する ( まなぶ, ならう, べんきょうする).