How many pixels has a page A4 ?

Depends on the resolution

Width=595.2756 px
Height=841.8898 px

A4 is a document format, as a screen image that's going to depend on the image resolution, for example an A4 document resized to:
72 dpi (web) = 595 X 842 pixels
300 dpi (print) = 2480 X 3508 pixels (This is "A4" as I know it, i.e. "210mm X 297mm @ 300 dpi")
600 dpi (print) = 4960 X 7016 pixels

approx 932 x 1343 pixels

Good Question but you found proper answer already from Dr Don Yates Sr PhD

hmm... Finish answer is??

nice one info lol.... thanks for such a nice article

Thanks take care Chris

Thanks Dr Don Yates, 5/5 stars. I just want to make some ads -magnetic for publicity on my car. I found the plastic-magnets and now must create the text

Hi
Have a nice day
It should be approximately 8739900. It can be accounted by knowing pixels in one row horizontally and vertically, than multiply each number.

yes it is correct depends on the resolution

Best Answer - Chosen by Asker
A4 is 210 x 297mm.
An image is expressed in pixels x pixels.
The two are totally different things.
You can put an image of 210 x 297 pixels on an A4, but you can also put an image of 21000 x 29700 pixels on the same A4 sheet!
If it is to print on a standard low cost printer, use a RESOLUTION of 72 pixels per inch: make your image 595 x 841 pxls, 72pxls/inch
For a better result, use 150pxls/inch and an image of 1240 x 1754 pxls.
For professional results