The term "impact factor" refers to journals only. Perhaps you mean your total number of citations or your h-index. See https://www.researchgate.net/profile/Debasish-Banerjee-4/stats for these values. For the number of citations of an individual publication, open the page of that publication and click on "Citations". However, ResearchGate's values are possibly underestimated. Very often, the numbers at Google Scholar are higher. See https://www.researchgate.net/post/Why_citation_score_for_author_publications_looks_different_on_Scopus_research_gate_google_scholar for more about this.