εἰ after ἐννοούμενοι 7, 5, 14

Specific Text Questions Cyropaedia
1

ἐννοούμενοι εἰ σφᾶς Φρύγες καὶ Λυδοὶ καὶ Ἀράβιοι καὶ Καππαδόκαι φυλάξοιεν
is this an indirect question? usually after ennoeo hoti is used