Consists of 114 chapters of varying lengths, each known as a sura (pl. suar). Chapters are classed as Meccan or Medinan, depending on where the verses were revealed. Chapter titles are derived from a name or quality discussed in the text, or from the first letters or words of the sura. Muslims believe that Muhammad, on God's command, gave the chapters their names. Generally, longer chapters appear earlier in the Qur’an, while the shorter ones appear later. The chapter arrangement is thus not connected to the sequence of revelation. Each sura with the exception of one, commences with the Basmala.
Each sura is formed from several ayat (verses), which originally means a sign or portent sent by God. The number of ayat differ from sura to sura. An individual ayah may be just a few letters or several lines. The ayat are unlike the highly refined poetry of the pre-Islamic Arabs in their content and distinctive rhymes and rhythms, being more akin to the prophetic utterances marked by inspired discontinuities found in the sacred scriptures of Judaism and Christianity. The actual number of ayat has been a controversial issue among Muslim scholars since Islam's inception, some recognizing 6,000, some 6,204, some 6,219, and some 6,236, although the words in all cases are the same. The most popular edition of the Qur’an, which is based on the tradition of the school of Kufa, contains 6,236 ayat.
There is a crosscutting division into 30 parts, ajza, each containing two units called ahzab, each of which is divided into four parts (rub 'al-ahzab). The Qur’an is also divided into seven stations (manazil) .The Qur’anic text seems to have no beginning, middle, or end, its nonlinear structure being akin to a web or net. Critics have commented on the textual arrangement pointing out lack of continuity, absence of any chronological or thematic order, and presence of repetition