Will someone please explain how the return statement interacts with loops in this code?

Question

For IsPrime, how does the code work so that, in the case of a nonprime, the return false statement is not overwritten by the return true statement below it?
function isPrime(num) {
for ( var i = 2; i < num; i++ ) {
if ( num % i === 0 ) {
return false;
}
}
return true;
}
function display(n) {
var arr = [,2 + "</br>"];
for ( var i = 3; i < n; i+=2 ) {
if ( isPrime(i) ) {
arr.push(i+"</br>");
}
}
document.write(arr); // use arr result on your own
}
display(10);
//this is not my code. I got it from nanobash at //https://stackoverflow.com/questions/21966000/need-to-generate-prime-numbers-in-javascript
// and made some tweaks

Answer 1

it stop the function execution, including the loop it reside in