Is 15 a prime number? The question is a query whose answer falls under the mathematical category of prime number theory. A prime number is a natural number greater than 1 that is not a product of two smaller natural numbers. For example, 15 is not a prime number because it can be expressed as the product of 3 and 5.
Prime numbers have been studied for centuries, and they have many applications in mathematics, computer science, and other fields. For example, prime numbers are used in cryptography, the study of codes and ciphers, and they are also used in factoring large numbers.