Prémunir belong to the 2
nd group.
Prémunir is conjugated the same way that verbs that end in :
-ir
Prémunir is conjugated with
auxiliary avoir.
Prémunir verb is direct transitive.
French verb prémunir can be conjugated in the reflexive form:
Prémunir verb is a direct transitive verb, so ive voice can be used.