Add a polygon programmatically in OpenLayers 3?

Question

I added a point like this and it works fine, but for polygon it's not working.

var iconFeature = new ol.Feature({
          geometry: new ol.geom.Point([8637791.36, 1456487.82]),
          name: 'Null Island',
          population: 4000,
          rainfall: 500
        });
var vectorSource = new ol.source.Vector({
  features: [iconFeature]
});

var vectorLayer = new ol.layer.Vector({
  source: vectorSource
});

My code for polygon is as follows -

var poly = new ol.Feature({
        geometry: new ol.geom.Polygon([8623931.28, 1449016.75],[8624007.72, 1458265.63],
                    [8629358.31, 1458571.37],[8628441.06, 1455284.58],[8625765.77, 1449781.12],[8630275.55, 1453450.09],
                    [8629281.88, 1452456.42],[8627294.51, 1451080.54],[8625765.76,1449781.11],[8623931.28, 1449016.75]),    
        name: 'hello',
        population: 200,
        rainfall: 40
        }); 
var vectorSource1 = new ol.source.Vector({
  features: [poly]
});

var vectorLayer1 = new ol.layer.Vector({
  source: vectorSource1
});

map.addLayer(vectorLayer,vectorLayer1); 

It's not adding polygon to map. Also on click I want a popup showing name, population and rainfall

Answer 1

Polygon geometry needs two additional pairs of brackets

    geometry: new ol.geom.Polygon([[[8623931.28, 1449016.75],[8624007.72, 1458265.63],
                [8629358.31, 1458571.37],[8628441.06, 1455284.58],[8625765.77, 1449781.12],[8630275.55, 1453450.09],
                [8629281.88, 1452456.42],[8627294.51, 1451080.54],[8625765.76,1449781.11],[8623931.28, 1449016.75]]]),