198 (number)

In mathematics

• 198 is an even number
• 198 is an abundant number, as 270 is greater than 198
• 198 is a composite number
• 198 is a Harshad number, divisible by the sum of its digits
• 198 is a practical number
• 198 is a self number
• 198 is between the twin prime pair of 197 and 199
• 198 is a 67-gonal number

  In astronomy

• 198 Ampella is a large S-Type Main belt asteroid

  In the military

• 198th Airlift Squadron flies the C-130 Hercules. It is a unit of the Puerto Rico Air National Guard
• 198th Battalion, CEF was a unit in the Canadian Expeditionary Force during World War I
• 198th Infantry Brigade a unit of the United States Army Reserve's 99th Division from 1967–1971
• No. 198 Squadron RAF was a Royal Air Force aircraft squadron during World War II
• is a United States Navy fleet replenishment oiler
• was a United States Navy during World War I
• was a United States Navy Maricopa-class auxiliary fleet tug following World War II
• was a United States Navy during World War II
• was a United States Navy during World War II
• was a United States Navy Alamosa-class cargo ship during World War II
• was a United States Navy Falcon-class coastal minesweeper during the Vietnam War
• was the lead ship of her class of submarine in the United States Navy during World War II
• 198th Division was a military formation of the People's Volunteer Army during the Korean War

  In other fields

• The year AD 198 or 198 BC
• The atomic number of an element temporarily called
• Keeping the Promise for a Strong Economy Act, 2002 is an Ontario legislative bill effective April 7, 2003 which provides for regulation of securities issued
• Minuscule 198 is a Greek minuscule manuscript of the New Testament