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function isPrime(num) {
  //return true if num is prime.
  //otherwise return false
  //hint: a prime number is only evenly divisible by itself and 1
  //hint2: you can solve this using a for loop
    //note: 0 and 1 are NOT considered prime numbers
    if (num===0 || num===1) {
        return false;
    } //end if
    else {
        for(var i=2; i<num;i++) {
            if(num%i===0){
                return false;
            } //end if
        } //end for
    } //end else
    return true;
}

console.log(isPrime(7));