Dear Sadaf Fatima It depends. If you want to remove a paper from the scientific literature then you need to retract the paper first (just removing here will mean that the paper remain 'alive').
It depends on whether the paper has been picked-up by ResearchGate or is 'only' here because you (or one f your co-authors) uploaded the paper manually. If uploaded by RG then the paper needs to be retracted first before it can be removed here on RG.
May I ask why you want to remove a paper (and which paper you refer to)?