Find Prime number by sqrt(JAVA)

import java.util.Scanner;
public class squire{
public static void main(String args[]){
Scanner shuvo=new Scanner(System.in);
int n,i=2;
System.out.println("Enter the number:");
n=shuvo.nextInt();
int temp= (int) Math.sqrt(n);
System.out.println(temp);
if(n%i==0)
{
System.out.println("The number is not prime");
}
else
{
   System.out.println("The number is prime");
}
}
}

Dual triangle by applet(JAVA)

import java.awt.*;
import java.applet.*;
/*
<applet code="HourGlass" width=230 height=210>
</applet>
*/
public class HourGlass extends Applet {
public void paint(Graphics g) {
int xpoints[] = {30, 200, 30, 200, 30};
int ypoints[] = {30, 30, 200, 200, 30};
int num = 5;
g.setColor(Color.red);
g.fillPolygon(xpoints, ypoints,num);
}
}

Rectangle(JAVA)

import java.awt.Graphics;
import java.awt.Color;
public class First extends java.applet.Applet
{
public void paint(Graphics g)
{
int width = 200;
int height = 200;
g.drawRect(0, 0, width, height);
}
}

Find the prime number(JAVA)

import java.util.Scanner;
public class prime{
public static void main(String args[]){
System.out.println("Enter digit:");
Scanner shuvo=new Scanner(System.in);
int i,j=1,n;
n=shuvo.nextInt();
for(i=2;i<=n/2;i++)
{

if(n%i==0)
{
j=0;
break;
}
}
if(j==0)
{
System.out.println("The number is not prime");
}
else
{
System.out.println("The number is prime");
}
}
}

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Asian University Of Bangladesh
Name: Shuvo Sarker
Student id: 201210659
Complex: Uttara
Dept: CSE