Your eye notices more difference between a 5 pixel image and a 10 pixel image than between a 900 000 pixel image and a 1 million pixel image.
Here are the real values for a 16:9 monitor (most common aspect ratio nowadays):
2160p: 3840×2160.
1440p: 2560×1440.
1080p: 1920×1080.
720p: 1280×720 = 921 600 pixels.
480p: 854×480 = 409 920 pixels.
360p: 640×360 = 236 160 pixels.
240p: 426×240 = 102 240 pixels.
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