JSFiddle - React, Tailwind, and code Playground

HTML

<p id="answer"></p>

JavaScript

var prime=0;
var number=13195;
var factor=0;
var counter=0;

for(i=1; i<number; i++){
	if(number%i===0){
		factor=i;
		for(j=2; j<factor/2; j++){
			if (factor%j===0){
				counter=counter+1
			}
		}
        if (counter===0){
	        prime=factor;
        }
    }
    counter=0;
}
document.getElementById("answer").innerHTML="ans = "+prime;