2016, IIUM has a teaching hospital called "IIUM Medical Centre" at Kuantan. Other than the teaching hospital, IIUM has a number of clinics and a specialist medical centre which are also at Kuantan, a Health and Wellness Centre at Gombak and a satellite clinic at Centre for Foundation Studies at Gambang. Sultan Haji Ahmad Shah Mosque Sultan Haji Ahmad Shah Mosque is located at the centre of Gombak Campus. The mosque's main prayer hall has a maximum capacity of 9000 people, with female prayer halls on the second and third levels. The mosque organises lectures, seminars and classes on concepts such as marriage and Janazah management, Tilawah and Tahfiz Al-Qur'an, as well as activities such as Qiyamullail and Tarbiyyah and training for students. Sultan Haji Ahmad Shah Mosque was also built in Kuantan Campus. Academics Students IIUM started with 153 students in 1983. Today, approximately 3,000 students enrol each year. There have been, so far, approximately 27,000 students from over 40 Muslim majority countries studying in IIUM, as well as students from non-Muslim majority countries, such as Germany, Finland, China, South Korea, Japan, India, United States of America, Russia, Thailand, Laos, Cambodia, Burma, Vietnam, Sri Lanka and the Philippines. From 1987 to 2012, 60,785 graduates and postgraduates have completed their studies at IIUM. Out of this, 53,241 were from Malaysia while 7,530 were international students. Having graduates all over the world, IIUM has established alumni chapters in Thailand, Bosnia and Herzegovina, Indonesia, Maldives, Australia, Saudi Arabia, Oman and Singapore. Branches of alumni chapters have also been opened in Turkey, China, Nigeria, the Philippines, Yemen, Brunei, Senegal, South Africa, Sri Lanka, Bangladesh, Gambia, Guinea and the United Arab Emirates. Medium of instruction The medium of instruction is English, with Arabic used in courses related to the study of Islamic sciences like theology, jurisprudence and ethics. Basic Arabic is a compulsory course. In addition, basic Malay language is compulsory for international undergraduate students. Usrah IIUM is the only public university in Malaysia that requires all of its foundation and undergraduate students to attend Usrah, i.e. Islamic study circle held weekly for the purpose of social, spiritual and intellectual enhancement. Since the establishment of IIUM, Usrah has been a requirement for students to graduate from IIUM. Since 2014, a separate Usrah has been held at residential colleges in addition to centralised Usrah, which is also compulsory to intermediate undergraduate students living in campus.