is_even but really terrible (JS)

is_even.js

function is_even(n) {
    if(n == 0) return true;
    var even_numbers = [];
    for (var i = 0; i < n; i++) {
        if(is_even(i)) {
            even_numbers.push(i);
        }
    }
    return (even_numbers.indexOf(n - 1) === -1);
}

// test
const TEST_MAX = 2048;
for(var i = 0; i <= TEST_MAX; i++) {
    console.log(`Testing if ${i} is even...`);
    console.time(`test${i}`);
    let result = is_even(i);
    console.timeEnd(`test${i}`);
    console.log(`Result: ${result}`);
}