Nauru is an island country located in the Pacific Ocean. It is one of the smallest countries in the world, and its population is around 9,000 people. The official language of Nauru is English, and the currency is the Australian dollar. To call Nauru from Guyana, you need to dial the international access code for Guyana, which is +592, followed by the country code for Nauru, which is +674. Then, dial the phone number of the person you are calling.