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primeNumber.java

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import java.util.Scanner;

public class primeNumber {

public static boolean isprime(int n){

// if(n==0 || n==1)

// return false;

// if(n==2)

// return true;

// for(int i=2;i<n/2;i++){

// if(n%i==0)

// return false;

// }

// return true;

if(n!=2 && n%2==0)

return false;

for(int i=2;i<=Math.sqrt(n);i++){ // algorithm

if(n%i==0)

return false;

}

return true;

}

public static void main(String[] args) {

Scanner sc=new Scanner(System.in);

int n=sc.nextInt();

if(isprime(n))

System.out.println("Prime number");

else

System.out.println("not a prime number");

sc.close();

}

}