![]() E xamples of prime numbersĪn example of a prime number is 13. The fundamental theorem of arithmetic states that a composite number can be expressed as the product of prime numbers. ![]() Prime numbers are often seen as ‘building blocks’ by mathematicians in number theory. What is a prime number?Ī prime number is a whole number greater than 1 with only two factors – itself and 1.Ī prime number cannot be divided by any other positive integer without leaving a remainder, decimal or fraction. In this guide, we will explain what exactly this means, give you a list of prime numbers children need to know at primary school, and provide you with some practice questions to find prime numbers. A prime number is a number that can only be divided by itself without remainders.
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