Ways to temporarily disable SQLPrompt
The easiest way to do this would probably be to stop prompt from even being loaded into SSMS. Which version of SSMS are you currently running?
If you're on SSMS2012 then you can remove prompt by changing the extension of the following file (eg put an underscore on the end of it)
%programdata%\Microsoft\SQL Server Management Studio\11.0\Addins\RedGate.SQLPrompt.SSMSUI.2011.AddIn