Численность населения Брюсселя: 1090 тыс. человек (по данным на 2010 г.)http://gorodamira.info/brusselиз них 25% мусульманIslam is the largest minority religion in Belgium, practiced by an estimated 6% of the total population. [1] 98% of the Belgian Muslims belong to the Sunni denomination, the rest are Shia (mainly Alevi). In Brussels Muslims cover 25.5% of the population, in Wallonia 4.0%, and 3.9% in Flanders. [2]https://en.wikipedia.org/wiki/Islam_in_Belgium