“This is indeed a noteworthy increase” What does it mean and is it grammatically correct?

The phrase "This is indeed a noteworthy increase" means that the increase being referred to is significant or important. The word "noteworthy" suggests that the increase is worth mentioning or paying attention to, and "indeed" emphasizes the statement, often implying agreement or affirmation. Yes, the sentence is grammatically correct. It has a clear subject ("This"), a linking verb ("is"), and a subject complement describing the subject ("indeed a noteworthy increase").