How to identify the number of pixels of a mobile phone camera?

You take a photo (when taking the photo, adjust the image size to the largest size) and then transfer it to your computer to see what the size of the photo is.

Multiply it to get the phase element! For example, for a mobile phone with 2 million pixels, its maximum photo size should be 1600*1200

When multiplied, it equals 1920000, which is about 2 million