# prime number

to check wethere given number is prime or not?

January 10, 2011 at 10:53 AM

Hi Friend,

Try this:

```import java.util.*;

{
static boolean isPrime(int number){
boolean isPrime=false;
int i=(int) Math.ceil(Math.sqrt(number));
while (i>1){
if ((number!=i) && (number%i==0)){
isPrime=false;
break;
}
else if (!isPrime)
isPrime=true;
--i;
}
return isPrime;
}
public static void main(String[] args)
{
Scanner input=new Scanner(System.in);
System.out.println("Enter Number:");
int num=input.nextInt();
if(isPrime(num)){
System.out.println("Number is Prime!");
}
else{
System.out.println("Number is not prime!");
}
}
}
```

Thanks

February 18, 2011 at 6:43 PM

```import java.io.*;
{
public static void main(String args[])
{
int num;
try{
if(a%2!=0 || a==2)
{
System.out.println(a + "is a prime number");
}
else
{
System.out.println(a + "is not a prime number");
}
}
catch(Exception e){}
}

}
```

February 18, 2011 at 6:45 PM

This code is better for begginers

import java.io.*;

{

```public static void main(String args[])
{
int num;
try{
if(a%2!=0 || a==2)
{
System.out.println(a + "is a prime number");
}
else
{
System.out.println(a + "is not a prime number");
}
}
catch(Exception e){}
}
```

}

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