The below is the code for executing prime numbers. Plzz explain how it is working

Question

for($x=2;$x<=100;$x++)
{ for($y=2;$y<=$x;$y++) {
if($x%$y==0)
break;
}
if($x==$y)
echo $x."<br>";
}

Answer 1

x is the number you want to check if it's prime or not.
Now if it is divisable by some number y smaller then x (i.e. modulus is zero, i.e.divisable without rest), then it is not a prime and you can break the loop.
If it is only divisable by itself, i.e. x==y, then it echos it as a prime number.