In arithmetic and number theory, a prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself. Understanding prime numbers through illustrations In fact, the distribution of prime numbers in the universe is a deep mystery that has yet to be fully understood by mathematicians. They are used to create and solve problems in a wide variety of fields, including cryptography and physics. Prime numbers have many uses in mathematics and elsewhere. What are prime numbers?Ī prime number is any natural number greater than 1 that cannot be divided evenly by any other number except for itself. For example, 5 is a prime number because the only ways of writing it as a product, 1 × 5 or 5 × 1, involve 5 itself. A natural number greater than 1 that is not a prime number is called a composite number. In mathematics, a prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself.
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