Can I change a project ID?

Yes, as long as you have Admin privileges you can update this in your account. See below:

To Enable Custom Project IDs:

1. Top right, click your name and select Settings (see below if you do not see the Settings option)
2. Click on the System tab.
3. Click the Edit button.
4. Put a check next to Allow Custom Project IDs.
5. Click the Save button.

Now when you create or edit a project you will see a field to enter the project ID.

Note: If you do not have administrative privileges you will not be able to get to the Settings, ask your administrator to change this option for you.