# JavaScript: Pronic number

## JavaScript Math: Exercise-72 with Solution

Write a JavaScript program to check if a given number is pronic using the product of two consecutive numbers. If the number is pronic return true otherwise false.

From Wikipedia –

A pronic number is a number that is the product of two consecutive integers, that is, a number of the form n(n+1). The study of these numbers dates back to Aristotle. They are also called oblong numbers, heteromecic numbers, or rectangular numbers; however, the term "rectangular number" has also been applied to the composite numbers.

The first few pronic numbers are:

0, 2, 6, 12, 20, 30, 42, 56, 72, 90, 110, 132, 156, 182, 210, 240, 272, 306, 342, 380, 420, 462 ...

**Sample Data:**

6 -> true

110 -> true

200 -> false

**Sample Solution:**

**JavaScript Code:**

```
/**
* Checks if a given number is a pronic number.
* @param {number} n - The number to check.
* @returns {boolean} - True if the number is pronic, false otherwise.
*/
const is_Pronic = (n) => {
// Check if the number is 0 (0 is considered a pronic number)
if (n === 0) {
return true;
}
// Calculate the square root of the number
const sqrt = Math.sqrt(n);
// Check if the square root is not an integer and the product of the ceiling and floor of the square root is equal to the number
return sqrt % 1 !== 0 && Math.ceil(sqrt) * Math.floor(sqrt) === n;
};
// Test the function with different numbers
console.log(is_Pronic(6)); // Output: true
console.log(is_Pronic(110)); // Output: true
console.log(is_Pronic(200)); // Output: false
```

Output:

true true false

**Flowchart: **

**Live Demo: **

See the Pen javascript-math-exercise-72 by w3resource (@w3resource) on CodePen.

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