Would it be a case that it is not possible to disable the Right Click option when loading the original image, by entering its Image address into the Browser?
No. You can’t control this.
Assuming this is the case, is it possible to prevent the Image from loading when entering the Image Address directly within the browser?
Possibly, but requests for files on the server bypass WordPress entirely, so any solution would need to be implemented outside of WordPress.
If there is a way, would this prevent the image from loading in Blog Posts etc too?
In all likelihood, yes.