# C++ Program to check number is prime or not using the function

In this Program, You will learn how to check number is prime or not using the function in C++.

`List of prime numbers => 2, 3, 5, 7, 11, 13, 17, 19`

## Example: How to check number is prime or not using the function in C++.

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

#### Output:

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