Three is an example of a prime number. The only two numbers that you can multiply together to get three are one times three. One times three equals three, and there are no other factors.

Twin Prime Numbers: The prime numbers with only one composite number between them are called twin prime numbers or twin primes. For example, 3 and 5, 5 and 7, 11 and 13, 17 and 29, etc.

Using a notion called integer partitions, mathematicians have discovered a new way to detect prime numbers while also ...

For centuries, prime numbers have captured the imaginations of mathematicians, who continue to search for new patterns that ...

Teacher Notes. This can form an introduction to prime and composite numbers, and lead to discussion of ways to speed up identification of primes/composites, for example, using divisibility tests.

We also have a KS2 Maths quiz and lots of examples. ... This means 98 has more than two factors, so it's not prime. 57 is a composite number. 57 is not even and doesn't end in 0 or 5.

The highly composite number 60, for example, has become our standard for measuring time as it can be split into convenient equal portions of whole numbers—30 minutes (half an hour), 15 minutes ...

'Mersenne primes' are those that take the form 2 n – 1. Not all numbers in this format are primes, of course. For example, 2 x 2 x 2 x 2 = 16, with 1 fewer equalling 15 (a composite of 3 and 5).

Digitally delicate prime numbers become composite with this one weird trick. Math researchers proved these primes exist using the bucket proof method. There are no known examples so far, but ...