Often times you need to write a query to list out all issues in a sprint, and the most efficient way to do this is to write a JQL that references the Sprint id.
I am not entirely sure why, but there are times when just typing the Sprint number in the JQL editor doesn’t prompt it to complete the sprint id for you.
In such cases you need another way to find out the id of your Sprint. I know only one way of doing this which is kind of a silly way, but it is effective.
Not the most elegant way to look for this information, but is certainly effective and quick.