In English QU is always used as a digraph.
Que pronounces the sound [K] at the ending of many words:unique, technique, antique, physique, clique, grotesque.
However, the combination QU has the sound [kw] instead of [K] at the beginning and in the middle of many English words: queen, quarter, quite, quiet, question, squad, squirrel, require, inquire.
Then, why is the qu in Conquer pronounced [k]?
Would it be C+on+qu+er or C+on+que+r?
Is there anything to do with its Middle English form?
Origin of "conquer": 1200–50; Middle English conqueren < Anglo-French conquerir, Old French conquerre < Vulgar Latin *conquērere to acquire (for Latin conquīrere to seek out).