indexOf keeps returning -1 Javascript

For the life me of I can't figure out why indexOf cant find the number in the array. It keeps returning -1. My goal is to ban a noun and put it into a ban array list, the list must be unique. So each element in the array must be different. Since I keep getting -1, my while loop is never executing.

Can anyone please explain to me what I'm doing wrong!

if( useA < 101 && totalAs < 5){
    article1Num = 4; // A
    noun1Num = [Math.floor(Math.random() * 5)];  
//^^^ random number to try use

//-------- 
    // Code to check if number is ban
    alert("Test Noun1Num is " + noun1Num);
    alert(bannedNounsTest.indexOf(noun1Num));   
//^^^^ITS ALWAYS -1 !!!!!!! EVEN if there is a match!
    while (bannedNounsTest.indexOf(parseInt(noun1Num)) >= 0 ) {   
// ^^^searching the value of the current noun in ban, -1 if none
        alert("In Loop and noun1Num is " + noun1Num);
        noun1Num = [Math.floor(Math.random() * 5)];  
// ^^looking for new number not in index while
    }

//----------

bannedNounsTest.push(noun1Num); // put in ban list
    totalAs++;