# JavaScript: Check a number is Sastry number or not

## JavaScript Math: Exercise-87 with Solution

Write a JavaScript program that checks whether a number (positive integer) is a Sastry number or not.

The number N is a Sastry number when it is concatenated with N+1 and gives a perfect squares. Some Sastry numbers are 183, 328, 528, 715, 6099, 13224, 40495, 106755, 453288, 2066115, 2975208, 22145328, 28027683, 110213248...

**Test Data:**

(27) -> false

(328) -> true

(28027683) -> true

**Sample Solution:**

**JavaScript Code:**

```
/**
* Function to check if a number is a Sastry number or not.
* @param {number} n - The input number.
* @returns {boolean} - True if the number is a Sastry number, false otherwise.
*/
function test(n){
// Concatenate n with n+1 and convert it to a string, then find the square root and check if it's an integer
return Number.isInteger(Math.sqrt(`${n}${n + 1}`));
}
// Test cases
// Assign value to n
n = 27;
// Print the original number
console.log("Original number: " + n);
// Check if the number is a Sastry number and print the result
console.log("Check the said number is Sastry number or not: " + test(n));
// Repeat the above steps for different values of n
n = 328;
console.log("Original number: " + n);
console.log("Check the said number is Sastry number or not: " + test(n));
n = 28027683;
console.log("Original number: " + n);
console.log("Check the said number is Sastry number or not: " + test(n));
```

Output:

Original string: 27 Check the said number is Sastry number or not: false Original string: 328 Check the said number is Sastry number or not: true Original string: 28027683 Check the said number is Sastry number or not: true

**Flowchart: **

**Live Demo: **

See the Pen javascript-math-exercise-87 by w3resource (@w3resource) on CodePen.

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