Answer:
Yes,the Koran is the holy scripture of Islam. It is considered the followers of Islam (muslims) to be the final revelation that confirmed that which came before it (Gospel, Psalms and Torah), which is essence was the worship of only one god. This is supported by the fact that the Quran mentions the ten commandments, with the first and most important one being to single out the worship of only One God and not associate any partners with God.
However, the Quran at times is general, whereas the Sunnah (Prophet guidance, which consist of sayings, actions and tacit approvals of Muhammad) is specific and explains the general verses of the Quran. The Sunnah is also scripture that is very important to Muslims.
For more information about the Quran and Sunnah, visit the youtube channel, realtruthaboutislam.