Does the Prime Meridian design shorter than other meridians?

No, the Prime Meridian is not shorter than other meridians; all meridians are of equal length. Each meridian, including the Prime Meridian, runs from the North Pole to the South Pole, making them all approximately 20,000 kilometers long. The Prime Meridian is simply the reference line for 0 degrees longitude, while other meridians are measured in degrees east or west of it.