Prime
In short
A prime number is a whole number greater than 1 that can only be divided exactly by 1 and itself.
In plain words
Most numbers can be broken down into smaller pieces by multiplying. Prime numbers cannot be split up this way. They are the basic building blocks of all other numbers.
A simple example
The number 7 is prime because nothing multiplies to make 7 except 1 and 7. In contrast, 6 is not prime because you can make it by multiplying 2 and 3.
Why it matters
Primes are essential for modern computer security and encryption. They help protect your private data and bank details online through complex mathematical codes.
Easy to mix up
Do not confuse prime numbers with odd numbers, as 2 is a prime number but it is even.