returns factors for an integer

getFactors.js

/**
* getFactors - find all factors of an integer in pairs
* @param, N, an integer
* returns a multidimensional array (e.g. 4 gets: [1,4],[2,2],[4,1])
*/
function getFactors(N) {
  
    "use strict";

    var x;
    var pairNum, factors = [];

    for (x = 1; x <= N; x++) {
        if ( N % x == 0) {
            var pairNum = [];
            pairNum.push(x);
            pairNum.push(N/x);

            factors.push(pairNum);
        }
    }

    return factors;
}