for your additional details:
your question is not good Mandarin at all.
Native speakers will never ask"什么是这文字吗“
the correct way of asking is: 这是什么字?
1)文字 means written language and it can also mean hieroglyph, it's a concept of type and group.
e.g. 文字优美 means written beautifully,
中国三千年前就有了文字。 Written language started in 3000 years ago in China.
But when you ask the meaning of a character, you use 字 instead of 文字.
e.g. 这个字怎么写?how to write this character?
tips: when you want to ask the meaning of a word, you use 词(ci2), and sentence, 句子(ju2 zi)。
e.g. 这是什么词?what is this word?
这个句子是什么意思?What is the meaning of this sentence?
2) in Chinese, we usually start a question by 什么是 when we want to ask about the definition of something, especially the definition of a concept, or specific technical or scientific term or a type of product.
e.g.: 什么是历史? what is the definition of history?
什么是艾滋病?what is the definition of AIDS?
And when asking the definition of a word/character/sentence, we will use “这是什么字/词/句子?”
Or you can use "这是什么?“ in asking virtually anything.