Krishna has finished. Every teaching has been given. Every secret has been shared. And now, with the quiet concern of a teacher who truly cares, He asks: Partha, did you hear all of this? Was your mind focused? Dhananjaya — has the delusion that was born from ignorance been destroyed?
There is deep affection in this question. A teacher who has poured out everything does not ask 'did you hear me?' out of ego. He asks because the entire purpose of the teaching rests on one thing: whether it landed. Whether the student's confusion has actually cleared.
Two names are used — Partha (son of Pritha) and Dhananjaya (conqueror of wealth). These are not casual. They remind Arjuna of who he is: the son of a great lineage, a proven warrior. Krishna is calling Arjuna back to his own strength, even as he checks whether the teaching has done its work.