Special type of numbers (pronic) in JavaScript

We are required to write a JavaScript function that takes in a number and returns true if it is a Pronic number otherwise returns false.

A Pronic number is a number which is the product of two consecutive integers, that is, a number of the form −

n(n + 1)

Example

The code for this will be −

const num = 132;
const isPronic = num => {
   let nearestSqrt = Math.floor(Math.sqrt(num)) - 1;
   while(nearestSqrt * (nearestSqrt + 1) <= num){
      if(nearestSqrt * (nearestSqrt+1) === num ){
         return true;
      };
      nearestSqrt++;
   };
   return false;
};
console.log(isPronic(num));

Output

The output in the console −

true