1 Sq. Meter = 0.000 001 Sq. Kilometer
Square meter is an area unit in metric system and used widely in measuring the small lands, floor plans etc. SI spelling is "square metre". It equals to 10.7639104 square feet. The abbreviations are "m2" or "sq m".
Square kilometer is a metric system unit, used mostly in land measurement. Spelled as "square kilometre" in many countries. It equals to 100 hectares or 1 million square meters. The abbreviation is "km2" or "sq km".