Answer: The given compound is a covalent compound.
Step-by-step explanation:
Covalent compound is defined as the compound which is formed by the sharing of electrons between the atoms forming a compound. These are usually formed when two non-metals react.
An ionic compound is defined as the compound which is formed when electron gets transferred from one atom to another atom. These are usually formed when a metal reacts with a non-metal.
We are given:
A chemical compound having chemical name as nitrogen triiodide.
This compound is formed by the combination of nitrogen and iodine atoms. Both these elements are non-metals and thus form covalent compound.
The chemical formula for the given compound is

Hence, the given compound is a covalent compound.