1 Hectare = 15 500 031 Square Inches
Hectare is a metric system area unit and widely used globally in land measurement and agriculture. It equals to 10,000 sq. meters. The abbreviation is "ha".
Square inch is a very small area unit with both sides of the square are 1 inch in length. It's mostly used to measure the area of small objects. The abbreviations are "sq in" and "in2".