In this program, You will learn how to check a number is prime or not in C++.

`Some list of prime numbers is 2, 3, 5, 7, 11, 13`

## Example: How to check a number is prime or not in C++.

```
#include<iostream>
using namespace std;
int main() {
int n, p = 1, i;
cout << "Enter a number:";
cin>>n;
if (n == 1) {
cout << "Number is not prime:" << n;
} else {
for (i = 2; i < n; i++) {
if (n % i == 0) {
p = 0;
break;
}
}
if (p == 1) {
cout << "Number is prime:" << n;
} else {
cout << "Number is not prime:" << n;
}
}
return 0;
}
```

#### Output:

```
Enter a number:13
Number is prime:13
```