If one's inner monologue stops forever, is one necessarily an arahant?

Question in the title. I'm looking for answers citing either canonical scripture or the position of any particular school of Buddhism. The *inner monologue* in the question could also be read as mental chatter; mental noise; superfluous thoughts; extraneous thoughts; or the unnecessary thoughts that normal people have every moment. And I mean when the inner monologue has stopped for good; that is, the case when it never comes back. Another way to read this question might be, *Do arahants have an inner monologue?*