In every rakaah of their prayer, Muslims must recite Al-Fatiha.

Muslim recorded that Abu Hurayrah said that the Prophet said,

«مَنْ صَلَى صَلَاةً لَمْ يَقْرَأْ فِيهَا أُمَّ الْقُرْآنِ فَهِيَ خِدَاجٌ ثَلَاثًا غَيْرُ تَمَامٍ»

(Whoever performs any prayer in which he did not read Umm Al-Qur’an, then his prayer is incomplete.) He said it thrice.

Umm Al-Qur'an (literally means the mother of the Qur'an)here refers to Al-Fatihah (The Opening).

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Raka'ah from Wikipedia

Raka'ah (Arabic: ركعة‎, pl. ركعات raka'āt) are the prescribed movements and words followed by Muslims during salah (worship).

After turning to God in mind (niyyah) and ritual cleansing (wudu), the worshipper will stand quietly (qiyam) while reciting the first verses of the Qur'an. The second part of the rak'ah involves bowing low (ruku') with hands on knees, as if waiting for God's orders. The third movement (sujud) is to prostrate oneself on the ground, with forehead and nose on the floor and elbows raised, in a posture of submission to God. The fourth movement is to sit (julus) with the feet folded under the body. The prayers end as the worshippers turn to the left and right saying, "Peace be upon you, and God's blessing". This action reminds Muslims of the importance of others around them, both in the mosque and in the rest of the world.

It also refers to one unit of Islamic prayer, or salah. Each daily prayer is made up of a different number of raka'at:

• Fajr — The dawn prayer: 2 raka'at
• Dhuhr — The noon prayer: 4 raka'at
• Asr — The afternoon prayer: 4 raka'at
• Maghrib — The sunset prayer: 3 raka'at
• Isha'a — The night prayer: 4 raka'at

The Jumu'ah (Friday prayer) consists of 2 raka'at and is prayed in place of the Dhuhr prayer on Friday.

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Muslim saying takbeer (Allahu Akbar) in every movement of their prayer (shalat).

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How many raka'ah Muslims pray per day?

2 + 4 + 4 + 3 + 4 = 17 raka'ah. (except Friday).

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See how the numbers of Al-Fatihah match to the raka'ah/day,

Al-Fatihah is surah number ONE (1) with total 7 verses.
Combine:  17
Match to Raka'ah/day.

Now, multiply the numbers of Al-Fatihah to the raka'ah/day.

17 x 17 = 289