Q:

# What numbers are only divisible by themselves and one?

A:

The only numbers that have two divisors, themselves and one, are prime numbers. Prime numbers are always greater than one and are positive numbers.

## Keep Learning

Credit: George Diebold Blend Images Getty Images

Prime numbers are also called prime integers. Euclid showed around 300 B.C. that there are infinitely many prime numbers. Being a prime is referred to as a property and is called primality. There have been many algorithms built to try to predict and factor prime numbers and are normally referred to as prime factorization. These algorithms can vary in complexity, but there has yet to be one made that can be used for general purpose use. The opposite of a prime number is called a composite. All even numbers above the number two are considered composite because they have multiple positive integer divisors.

Sources:

## Related Questions

• A: Learning to hear and say numbers in any language is a very important for day-to-day communication in that language. To learn numbers in English, you can br... Full Answer >
Filed Under:
• A: The first 10 natural numbers are 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10. A natural number refers to any integer that is equal to or greater than 1, although 0 is... Full Answer >
Filed Under:
• A: Teachers use prime and composite numbers charts to teach students to identify prime and composite numbers as they shade them with two different colors. A p... Full Answer >
Filed Under:
• A: A number sentence is an equation or an inequality which is written with numbers and symbols rather than words. The term is most often used in the early gra... Full Answer >
Filed Under: