How to find prime numbers from 1 to 100

public class PrimeNumber1To100 {

	public static void main(String[] args) {

		System.out.println("Prime numbers from 1 to 100 are :");

		for(int i=1;i<=100;i++) {
			
			int counter=0;
			for(int num = i;num>=1;num--) {
				
				if(i%num == 0) {
					
					counter++;
				}
			}
			if(counter == 2) {
				System.out.print(i+" ");
			}
		}
	}

}

Output:- 
Prime numbers from 1 to 100 are :
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97