FROM THE SAME SOURCE:
Population (31 March 2012)
City 303,873
Urban 280,415
Urban density 3,651/km2 (9,460/sq mi)
Metro 664,428
Metro density 264/km2 (680/sq mi)
Malmö Kommun (more or less the inner city) has a population of 315 076. A quarter of them are said to be Muslims (there's no official stats).
Greater Malmö has a population of 681 721 if we are to believe Statistics Sweden. Few of those who dwell outside the inner city are Muslims.
Sources (consult google translate if you wish):
http://sv.wikipedia.org/wiki/Malm%C3%B6_kommun
http://sv.wikipedia.org/wiki/Stormalm%C3%B6