Xiaodong and his classmates took 138 photos and put them in an album. The number of photos on each page is the same, and there are only 2 photos on the last page. How many pages are there in this photo album? How many photos should I put on each page?

138-2= 136

136=2*2*2* 17

That is, * * * has 18 pages, with 8 pages per page.