leap years are evenly divisible by 4. the most recent leap year was 2020 and the next leap year will be 2024. however, any year that is evenly divided by 100 would not be a leap year unless it is evenly divided by 400. this is why 1600, 2000, and 2400 are leap years, while 1700, 1800, 1900, 2100, 2200, and 2300 are common years, even though they are all divisible by 4.