For Muslims, the Quran isn’t a book someone wrote: it’s the word of God, revealed to the prophet Muhammad through the angel Gabriel, over about 23 years (610 to 632 AD), in Mecca and Medina.
114 chapters (surahs), in Classical Arabic; about 6,236 verses, or 6,348 if you count the formula that opens each surah. The first one, Al-Fatiha (“The Opening”), is recited in every prayer. It’s split into thirty equal parts so it can be read in full during Ramadan.
It was memorised first and written on whatever was at hand (parchment, palm leaves, bones); gathered into one volume after Muhammad’s death, under the first caliph, Abu Bakr; and fixed into a standard text under the third, Uthman, around 650. That text is the basis of the Quran today.
And it names its predecessors: the Tawrat (The Torah, given to Moses), the Zabur (the Psalms) and the Injil (the Gospel). See also The Bible.