An electrical conduit is a system for routing and protecting electrical wiring. A cable conduit can be found wherever electrical wiring is needed. This includes wiring in appliances or in the walls of a home.
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In conduit is way better option. Protects the cable from people digging around it. At least will hit conduit before hitting the wire. Also protects the cable from whatever is placed in the hold when backfilling
No, the electrical code requires that the mineral insulated cable be strapped at proper intervals and not be piggy backed on to other conduit structures.
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For cable not in conduit and intended to be installed without conduit, such as NM cable, yes. You must provide some form of connector that will hold the cable in place. A clamp is not the only kind of connector that will do this but is the most common.
If 16mm is the overall diameter of the cable, yes - If that's the diameter of one core, then no.