Questions & Answers about zhège duì yǒu hěnduō rén.
Yes, 队 is the noun team. The 个 is a measure word / classifier used after 这 when pointing to a noun.
The pattern is:
这 + measure word + noun
So:
- 这个人 = this person
- 这本书 = this book
- 这个队 = this team
Even though 个 is the most common general classifier, some nouns also have more specific classifiers. For 队, you may also hear more specific forms in some contexts, but 这个队 is very normal and easy for learners to use.
Because 有 means to have or there is/are, while 是 means to be.
In this sentence, the idea is that the team has many people:
- 这个队有很多人。 = This team has many people.
If you used 是, it would not express possession or existence correctly here.
A helpful pattern is:
A 有 B = A has B
So here:
- 这个队 = this team
- 有 = has
- 很多人 = many people