A prime number is a positive integer that is divisible by exactly two different numbers, namely 1 and itself. The lowest (and only even) prime number is 2. The first 10 prime numbers are

2, 3, 5, 7, 11, 13, 17, 19, 23, 29

An integer \(n \in \mathbb{N}_0\).

A sentence that indicates if \(n\) is a prime.

## Tip

In a loop where you test the possible dividers of the number, you can conclude that the number is not prime as soon as you encounter a number other than 1 or itself that divides it. However, you can only conclude that it actually is prime after you have tested all possible dividers.

```
11
```

```
11 is a prime
```

```
12
```

```
12 is not a prime
```