A year is a leap year if it is divisible by 4, but century years are not leap years unless they are divisible by 400. So, the years 1700, 1800, and 1900 were not leap years, but the year 2000 was, which is why in a given 100 years, there are 24 leap years and 76 ordinary years.
Is the year 2000 a leap year?
Yes, 2000 was a leap year. Since 1752, in this country, years exactly divisible by 100 are only leap years when they are also exactly divisible by 400. So 1800 and 1900 were not leap years, neither will 2100 or 2200 be leap years.
Why was there no leap year in 1900?
So 1900, 1800 and 1700 were not leap years. So every year which is directly divisible by 400, has a leap year day. This is precisely why the year 2000 was a leap year. So the year 2000 was a leap year not because it was divisible by 4, but because it was divisible directly by 400.