# Function IsPrimeTarea - Tutorial C# Sharp

## Lesson 5:

## Functions

## Exercise 5.15:

## Function IsPrimeTarea

## Objetive:

##
Create a function named "IsPrime", which receives an integer number and retuns true
if it is prime, or false if it is not:

if (isPrime(127)) ...

## Source Code:

```
using System;
public class FunctionIsPrime
{
public static bool IsPrime(int n)
{
for (int i = 2; i < n; i++)
if (n % i == 0)
return false;
return true;
}
public static void Main()
{
if (IsPrime(127))
Console.WriteLine("127 is a prime number");
else
Console.WriteLine("127 is NOT a prime number");
if (IsPrime(1000003))
Console.WriteLine("1000003 is a prime number");
else
Console.WriteLine("1000003 is NOT a prime number");
}
}
```

Exercisey
5.15