Hi,

 I have been generating prime numbers in JavaScript i want to return true 
if it's a prime or false if it'not below is the code i am struggling with 
it. If a number is not a prime it should return  false but it's not.

function isPrime(number){     
      d = number-1;
      while (d > 1){
        if ((number % d) == 0) return false;
        d--;
      }
      return true;       
      
    }    
    
    if (isPrime(19)){
      alert('Prime');
    }
    else{
      alert('Not Prime');
    }
    
    //return 'false';

var val = isPrime();
document.getElementById('output').innerHTML = val;

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