zhè shì yínhángkǎ, tā de kǎhào zài zhèlǐ.

这 can stand on its own as this, so 这是... is a very common pattern meaning This is....

这个 is also possible in some contexts, but it usually feels more like this one. So:

• 这是银行卡。 = This is a bank card.
• 这个是银行卡。 = This one is a bank card.

The version with 这 is the most neutral and standard here.

Mandarin does not have articles like a, an, or the.

So 银行卡 by itself can mean something like:

• a bank card
• the bank card
• bank card as a category

The exact interpretation comes from context. In 这是银行卡, the sentence is identifying what the thing is, so English naturally uses a: This is a bank card.

It definitely can. In fact, 这是一张银行卡 is very natural.

The classifier 张 is used for flat objects such as cards, paper, tables, tickets, and photos. So:

• 这是一张银行卡。 = This is a bank card.

The shorter 这是银行卡。 is more concise and can sound like simple identification or labeling. It is understandable, but 一张 makes it feel more like you are talking about one physical card.

So both are possible, but 这是一张银行卡 is often the more textbook-friendly full form.

It is a compound noun:

• 银行 = bank
• 卡 = card

So 银行卡 literally means bank card.

In real use, it can refer generally to a card issued by a bank, such as a debit card or sometimes a credit card, depending on context.

它 is the written pronoun normally used for things and animals when they are not being treated as human.

Since a bank card is an object, 它 is the natural choice:

• 它的卡号 = its card number

A useful thing to know: in spoken Mandarin, 他, 她, and 它 are all pronounced tā. The difference is only visible in writing.

的 links a modifier to a noun. Here it shows possession, similar to English 's or of.

So:

• 它 = it
• 它的 = its
• 它的卡号 = its card number

You can think of the pattern as:

possessor + 的 + thing possessed

Examples:

• 我的名字 = my name
• 老师的书 = the teacher’s book
• 它的卡号 = its card number

卡号 means card number:

• 卡 = card
• 号 = number

So the full phrase breaks down like this:

• 银行卡 = bank card
• 卡号 = card number

The 卡 appears twice because the sentence is talking first about the object itself, and then about the number belonging to that object. This kind of repetition is very normal in Chinese compound words.

You could also hear:

• 银行卡号 = bank card number

That is even more specific.
By contrast, 号码 just means number in a more general way.

Because 在 is the normal word used to show location.

So:

• 卡号在这里。 = The card number is here.

In Chinese, when you say that something is located somewhere, the common pattern is:

subject + 在 + place

Examples:

• 书在桌子上。 = The book is on the table.
• 我在家。 = I am at home.
• 卡号在这里。 = The card number is here.

是 is used differently. It links one noun phrase to another, as in:

• 这是银行卡。 = This is a bank card.

So the first clause uses 是 for identification, and the second uses 在 for location.

Yes. Very often, Chinese leaves out pronouns when the meaning is already clear from context.

So these are all possible:

• 这是银行卡，它的卡号在这里。
• 这是银行卡，卡号在这里。
• 这张银行卡的卡号在这里。

All are understandable. Dropping 它 can sound quite natural because once 银行卡 has been mentioned, the listener already knows what the next clause is about.

Yes. 这里 and 这儿 both mean here.

• 这里 is neutral and widely used.
• 这儿 is more colloquial, especially in northern Mandarin.

So:

• 卡号在这里。
• 卡号在这儿。

Both are correct. The first is a bit more neutral; the second sounds a bit more conversational.