Yep.

The coolant is water that circulates probably in pipes around the electric motor. In wintertime you add antifreeze to the water and it becomes a mixture (A side note: antifreeze is not a good coolant all by its self and that's why you have to make sure there is still enough water in the mix).

The water is then cooled by radiators in the front of the engine by the air blowing through them. The air is either blown through by the motion of the car or (in the prius) fans driven by electric motors.

The other option is an air-cooled engine where the engine is cooled directly by air blowing over the engine. Most cars these days are water cooled.

Christian