prime number would be positive

Author: MalihaKabir

primeNum.js

@@ -21,9 +21,10 @@
 // So, we've got that 33 is not a prime number.
 
 // Now let's write this in code:
+// (N.B. given num/integer must be positive. That's why i>1)
 const primeNum = (num) => {
 const limit = Math.ceil(Math.sqrt(num));
-for (i = 2; i <= limit; i++) {
+for (i = 2; i > 1 && i <= limit; i++) {
 if (num % i === 0) {
 return false;
 }