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400 would have been a leap year.
The method for calculating leap years is a little complicated due to all the exceptions.
Years that are a multiple of 4 are a leap year, UNLESS the year is a multiple of 100 (then it is not a leap year), UNLESS the year is also a multiple of 400 (then it is a leap year).
Some examples
1800 - not a leap year because it is a multiple of 100
1900 - not a leap year because it is a multiple of 100
2000 - leap year because while it is a multiple of 100, it is also a multiple of 400
2100 - not a leap year because it is a multiple of 100
400 - leap year because while it is a multiple of 100, it is also a multiple of 400
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