The reason I want to know is because I want to make a wallpaper for my girlfriend that exactly fits the screen
3 Answers
Samsung devices allow, under Developer Options, the ability to mark screen locations.
See Settings > Developer Options > Input
Select Show Touches, Show pointer location
Move to the points desired, and note their coordinates.
If you find the constant coordinates undesitreable, turn OFF the options after the operation is complete to your satisfaction.
To turn on Developer Options if needed:
Go to app drawer and open Settings
Go to bottom and tap About device
Tap repeatedly Build number 7 times. Starting at 3rd tap, you'll see a toast saying You are now X steps away from being a developer.

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@GreedySkull
I think what you mean is the resolution
The screen is 5.1 inch high resolution Quad HD 1440×2560 pixel display with 577 pixels per inch.
Ensure the wallpaper you're making has a size of 1440×2560 so as to fit screen correctly

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