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How to find Prime Number

How to find Prime Number in Java

1. check the given number is prime or not.
2. print all the prime numbers upto a given a number
3. write different test cases


package Questions;
public class PrimeNumber {
//2 is the lowest prime number
//num = 20
public static boolean isPrimeNumber(int num){
//edge/corner cases:
return false;
for(int i=2; i<num; i++){
if(num % i == 0){
return false;
return true;
public static void getPrimeNumbers(int num){
for(int i=2; i<=num; i++){
System.out.print(i + ” “);
public static void main(String[] args) {
System.out.println(“2 is prime number: “+ isPrimeNumber(2));
System.out.println(“3 is prime number: “+ isPrimeNumber(2));
System.out.println(“10 is prime number: “+ isPrimeNumber(10));
System.out.println(“17 is prime number: “+ isPrimeNumber(17));
System.out.println(“0 is prime number: “+ isPrimeNumber(0));
System.out.println(“1 is prime number: “+ isPrimeNumber(0));
System.out.println(“-3 is prime number: “+ isPrimeNumber(-3));


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