Yes.
To pause the presentation simply click on the button on the GP4 interface.
If there is no Pause Presentation button but there is a Start Presenting button on the GP4 interface then you have not yet stared sharing in the meeting.

To resume the paused presentation simply click the button on the GP4 interface.

Note:	The guests will stay connected to the meeting but will see nothing while the host has paused presentation.
	The guest viewer window will re-appear once the presentation is resumed.