Can't figure out what I did wrong in this simple HW question [closed]

I am having trouble with figuring out why my code is incorrect and does not work the way I want it to. I am a high school student who started out in java not too long ago so my knowledge is very small so if you are helping please make it simple, I was ordered to write code that will receive as input a string that acts as a password and for the password to be accepted it needs to be at least 6 digits long and have at least 1 number and 1 letter.

Here's the code I wrote:

import java.util.*;


public class P21Q6
{
      static Scanner reader = new Scanner(System.in);
     
     public static void main(String[] args)
     {
         int i;
         String warning = "Password needs to be 6 digits long and have at least 1 number and 1 letter";
         boolean isProper = false;
         System.out.println("Insert a password"); 
         String pswrd = reader.next();
         while (isProper = false)
         {
             System.out.println("Insert a password"); 
             pswrd = reader.next();
             if (pswrd.length() >= 6)
             {
                 for (i = 0; i < pswrd.length(); i++)
                 {
                     if (((pswrd.charAt(i) <= 90 || pswrd.charAt(i) >= 65) || (pswrd.charAt(i) <= 122 || pswrd.charAt(i) >= 97)) && (pswrd.charAt(i) <= 57 || pswrd.charAt(i) >= 48))
                     {
                         isProper = true;
                        }
                    }
                } else
                {
                    System.out.println(warning);
                }
         }
         System.out.println("Passord registered");
     }   
}

I know this looks very clunky but I really did try to fix the problem. Thank you so much!