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The Universe is wonderful because of the great mystery behind numbers. No place can be smart without numbers. And the numbers do not exist without the prime numbers. Prime numbers are the infrastructure of recent digital technology. In this paper, I write about how prime numbers can motivate people to make smart cities more smart, beautiful, and secure. Smart cities are connected by digital technology. And digital technologies are related with the digits. And digits are related with numbers. And the backbone of the numbers is the prime numbers which are full of ambiguity and many challenging big problems for the whole world still enormously difficult for all the smartest mathematicians around the world. In this paper, I will show how prime numbers should have a great place in any smart city, especially in the Kingdom of Bahrain. For example, I present two new approaches to exploit the beauty and ambiguity of prime numbers to motivate smart cities to be a smarter, more enthusiastic environment, and safer. The first idea is to decorating towers and roads by prime numbers. The second idea is to establish a smart campus for the Prime Number Park in the smart cities to make sure these cities are consistent and in harmony with the beauty and the splendour of prime numbers.