Unfortunately, it is not possible to filter issues based on the number of Sprints using JQL in JIRA.
The best option I can recommend you to get this information would be to exporting the issues to a CSV file and using a spreadsheet software (Excel, Libre-Office, etc) to filter the Sprint column and return all issues with more than a single Sprint (They are separated by comma).
Let me know if this would be an option for you.
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