问话 is a separable verb (离合词) meaning 'to inquire' or 'to question someone'. The verb 问 and the object 话 can be separated when you need to insert a measure word, a duration, or a complement: e.g., 问了几句话 ('asked a few questions'). You can also use it as a single unit: 问话 means 'to ask questions' in a general sense, often implying a formal or investigative tone.