Conversation so far:
which city is called the city of flowers in pakistan
Peshawar's nickname is the City of Flowers.
Is the city of Peshawar a capital?
Peshawar is the capital of the Pakistani province of Khyber Pakhtunkhwa
how far does the city of peshawar date back to
Peshawar's recorded history dates back to at least 539 BCE, making it the oldest city in Pakistan

Question: what is the population of the city
Self-contained rewrite: what is the population of the city of peshawar