There are many different types of numbers, some of which you may remember from school: natural, rational, irrational, imaginary, calculable and incalculable numbers. Today, however, we are going to ...

What is your favorite number? For many people, it may be an irrational number such as pi (π), Euler’s number (e) or the square root of 2. Even among the natural numbers (positive integers), there are ...

Which is 9. So 9 is a square number. Here are some other examples of square numbers. Can you see how all these numbers can be arranged into a square? Which is 64. So 64 is a cube number. Here are some ...

Have you ever wondered why we call numbers that are divisible by two "even" and all the others "odd?" What makes things like one, three, five and seven any more odd than two, four, six or eight that ...

The square root of 2025 is 45. The divisors of 45 (apart from 45 itself) are 1, 3, 5, 9 and 15. The product of these numbers is 2025. The last year that was a square number was 1936. Does 1936 also ...

Katie has a PhD in maths, specializing in the intersection of dynamical systems and number theory. She reports on topics from maths and history to society and animals. Katie has a PhD in maths, ...