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Check if a Number is Prime in javaScript?

Create a function that outputs true if a number is prime, and false otherwise.

JavaScript
1 Answer
Mohammad Qandeel
Answered
13

This function returns true if a number is prime, and false otherwise

function isPrime(num) {
 for (i=2;i<Math.floor(Math.sqrt(num));i++){
  if (num%i==0){return false}
 }
 return true
}

Example

isPrime(5) // true

isPrime(50) // false

 

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