The answer will depend on the context i think. My definition is a device which converts natural (typically heat) energy into mechanical energy. It is the first thing that moves. Internal combustion engines, external combustion engines, turbines, etc. An electric motor is not because something had to move first.
A prime mover is an instigator
or
A machine, such as a water wheel or steam engine, that receives and modifies energy as supplied by some natural source or fuel and transforms it into mechanical work.
The Prime Movers - Michigan band - was created in 1965.
glutius maximus
trapezius
Synergists
Levator scapulae and trapezius
The tricep is the prime mover in the acceleration stage of the golf swing.
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your rectus abdominis is the prime mover in a crunch exercise or spinal flexion
jaw
Money and profit are the prime movers.
It depends on the movement. The prime movers for rotation are the splenius capitis and the sternocleidomastoid.
femur