No, a force cannot change the velocity of an object moving at a constant speed.
Velocity is a vector quantity that includes both speed (magnitude) and direction. When an object is moving at a constant speed, it means that its magnitude of velocity remains unchanged. However, if a force is applied to the object in a direction different from its current velocity, the object's direction of motion may change, but its speed (magnitude of velocity) will remain constant.
In other words, a force can change the direction of an object's motion or alter its velocity if the object is not moving at a constant speed. If the object is moving at a constant speed, any force acting on it will not affect its velocity, as long as the force is in the same direction as its initial motion.