Hi. Yes, you can, if you are a space admin. If not, you would have to ask one to do it for you.
This is how you do it:
Go to the page in question and choose the three dots on the top menu and click > Page History
Choose Delete next to the version that you want to delete.
All the detailed info about deleting pages and blogs you can find right here in the official documentation of Atlassian: https://confluence.atlassian.com/doc/delete-or-restore-a-page-139429.html#DeleteorRestoreaPage-deleteversion