Not the number itself, the reason for bombing them is because they're not just hospitals.
International law recognises using hospitals, schools and places of worship for military purposes (or as human shields) as a war crime which is why you are allowed to bomb those places if they are being used as such. And it is very, very odd and further proof (not that I need any personally) of what Hamas whole strategy is in this whole thing. Commit a genocidal act and then conduct a war as one big war crime and get the international world to focus on Israeli war crimes.