I have a question about the word ' pamphlet '

I have something just like the pamphlet.
But it is as big as the A4 print paper.
I don' t know whether or not can I call it ' pamphlet '
And can I put an ' s ' at the end of the word? ( When I want to descrip more than one )


Thanks.

To Jijia the pamphleteer
I would call it a pamphlet or several pamphlets. I assume your pamphlet does not have many pages.