Leap year check
No, 1691 is not a leap year.
1691 is not divisible by 4, so it is NOT a leap year, February has the usual 28 days.
A year is a leap year in the Gregorian calendar when it is divisible by 4, with one exception and one exception to that exception: a year divisible by 100 is not a leap year unless it is also divisible by 400. 1691 is not divisible by 4 (1691 ÷ 4 = 422.75), so it cannot be a leap year. The nearest leap years are 1688 before it and 1692 after.
1691 has no February 29, February ends on the 28th. The closest leap day is in 1692, when February 29 falls on a Friday. If you are counting toward a leapling birthday or a date-sensitive deadline, that 1692 leap day is the one to watch.
1691 runs 365 days, or 52 full weeks plus 1 day. The leap year before 1691 was 1688 and the next one is 1692, keeping the familiar four-year rhythm. To do date math across 1691, counting days to a deadline, an age, or an anniversary that crosses a leap day, use the days-between calculator, which handles leap days automatically.
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No, 1691 is not a leap year
1691 is not divisible by 4, so it is NOT a leap year, February has the usual 28 days.
Count leap years in a range
How many leap years fall between two years (inclusive).
4 leap years between 1691 and 1711 (21 years, about one every 5.25 years).