the number of persons per square kilometer in a country is called
Population density For humans, population density is the number of people per unit of area, usually quoted per square kilometer or square mile (which may include or exclude, for example, areas of water or glaciers). Commonly this may be calculated for a county, city, country, another territory or the entire world.
Indigenous peoples Precise estimates for the total population of the world's Indigenous peoples are very difficult to compile, given the difficulties in identification and the variances and inadequacies of available census data. The United Nations estimates that there are over 370 million indigenous people living in over 70 countries worldwide.[17] This would equate to just fewer than 6% of the total world population. This includes at least 5000 distinct peoples[18] in over 72 countries.