Is it possible to change a project number? Yes. When you edit a project through the edit button shown in the project details page, the project number and title cannot be edited and changed. The project number and title can only be changed by the Super User and the Account Administrators who are given access to the "Admin" menu. Please see below:
Edit a Project in the Admin Page
Edit a project's number and title
Go to the "Admin" page and scroll to the bottom to see the projects list;
This button is to edit a project;
Edit a project's number and title
Edit and change the project number;
Change the project number here;
Click update to save the changes;
The customer can be changed in the normal project edit page and project label can be changed there. They are shown here for reference.