# C# Program to check the square root of a number is prime or not

In this program, You will learn how to check the square root of a number is prime or not in C#.

`49 Sqrt is :7 => Prime`

## Example: How to check the square root of a number is prime or not in C#.

```
using System;
public class Program
{
public static void Main(string[] args)
{
int n, i = 2, p = 1;
double num;
Console.Write("Enter a number:");
num = Convert.ToDouble(Console.ReadLine());
Console.Write("Square root is:" + Math.Sqrt(num));
n = Convert.ToInt32(Math.Sqrt(num));
while (i < n)
{
if (n % i == 0)
{
p = 0;
break;
}
i++;
}
if (p == 1)
{
Console.WriteLine("\nNumber is prime:" + n);
}
else
{
Console.WriteLine("\nNumber is not prime:" + n);
}
}
}
```

#### Output:

```
Enter a number:49
Square root is:7
Number is prime:7
```