# prime numbers application

how to add a comment indicating that the method will determine if a number is a prime number. In the next line add the method header for this method which will be called isPrime. This method returns the value of a type boolean and takes an argument of type int, the parameter will be named number. Add a left brace on next line. in the body of the method add a comment stating that 1 is not a valid prime number, on the next line add an if statement to test whether the value of the parameter number is equal to 1.

October 22, 2010 at 10:58 AM

Hi Friend,

Try the following code:

```import java.util.*;

class CheckPrime{
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){
int num = 5;
if (isPrime(num)) {
System.out.println("Number is Prime");
}
else{
System.out.println("Number is not Prime");
}
}
}
```

Thanks

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