Population problems

Number 1: Last year there were 12,454 births and 6,565 deaths.
What was the natural increase?

Number 2: If 8,234 people left the country, how many immigrants would the country need to maintain the actual increase or surpass?

Number 3: What is the population density of a place with 2 square kilometres and 38,300 inhabitants?

Number 4: If the population density of a country is 93 inhabitants per square kilometre, how many people live in it with an extension of 500,000 square kilometres?