Many organizations ask for 'Impact Factor' and I wonder whether it is for a particular paper or for an individual and if it is for the individual then what all things should be considered? Please suggest.
Yes, One place you can obtain an impact factor from is from Google Scholar. I went there and found, for example, that yours is 2 and mine was 3. Your particular paper "Stress as a correlate of job performance..." was probably the main contributor to your impact factor.
If you think that was too high {!}, you can cite your impact points from ResearchGate, which currently stand at 1.15. Your RG impact points are most likely mainly from the same paper of yours, as it is the oldest, and has had the longest time to accumulate citations.
"It is important to note that impact factor is a journal metric and should not be used to assess individual researchers or institutions." Wikipedia quote
I'd say it is much more likely to be for a particular paper. While one could define an impact factor for a researcher (the average number of citations received per paper published by this researcher during the two preceding years), this does not seem to be a good performance indicator. For a researcher one typically uses other indicators (the total number of citations, h-index, etc.), see e.g. the link below.
I agree with Mauro Apostolico that the journal impact factors are not meant to be used to assess individual researchers.
Still summing the impact factors for a researcher's publications has become common. In ResearchGate it is called Impact Points and other call it the Impact Factor (for the researcher).