# Kotlin program to check whether a number is prime or not

Kotlin | Check prime number: Here, we are going to learn how to check whether a given number is prime or not in Kotlin programming language?
Submitted by IncludeHelp, on April 24, 2020

A prime number is a natural number that is greater than 1 and cannot be formed by multiplying two smaller natural numbers.

Given a number num, we have to check whether num is a prime number or not.

Example:

```    Input:
num = 83

Output:
83 is a Prime Number
```

### Program to check whether a number is prime or not in Kotlin

```/**
* Kotlin program to check given number is Prime Number or Not
*/

package com.includehelp.basic

import java.util.*

//Function to check Prime Number
fun isPrimeNo(number: Int): Boolean {
if(number<2) return false
for (i in 2..number/2) {
if (number % i == 0) {
return false
}
}
return true
}

//Main Function, Entry Point of Program
fun main(arg: Array<String>) {
val sc = Scanner(System.`in`)

//Input Number
println("Enter Number  : ")
val num: Int = sc.nextInt()

//Call Function to Check Prime Number
if (isPrimeNo(num)) {
println("\$num is a Prime Number")
} else {
println("\$num is not a Prime Number")
}
}
```

Output

```RUN 1:
Enter Number  :
83
83 is a Prime Number
---
RUN 2:
Enter Number  :
279
279 is not a Prime Number
---
RUN 3:
Enter Number  :
29
29 is a Prime Number
```