No, not every month has exactly 4 weeks and 7 days. Most months have either 30 or 31 days, which is not evenly divisible by 7. This means that some months will have 4 weeks and 2 or 3 extra days, while others may have 4 weeks and 3 or 4 extra days. Additionally, February has 28 days in common years and 29 days in leap years, which does not align with a perfect number of weeks.