Seven (7) is one of the numbers that is commonly used in many things. For instance, 7 days of the week, 7 colors of the rainbow, 7 notes to the diatonic scale, 7 dwarfs in Snow white, as well as 7 letters in the Roman numeral system.
The number 7 has a number of significance for instance the mathematical and biblical meanings.
Biblical significance of the number seven.
It signifies the number of completeness and perfection (both physical and spiritual). This is derived from the fact that the creation took six days and finally the seventh day (Sabbath) was completion.
The bible was originally divided into 7 parts thus the perfection of the Word of God. These include; the Law, the Prophets, the Writings (Psalms), the Gospels, the General Epistles, the Epistles of Paul as well as the book of the Revelations.
It is also believed that the number 7 is used 735 times in the whole bible thus the foundation of God’s word.
Mathematical significance of the number seven.
Mathematically, the number is used differently for instance;
It is the fourth prime number, and the lowest natural number that cannot be represented as the sum of the squares of three integers.
It is also the number that makes up the heptagon.
The smallest odd prime number that is not a Fermat prime number.
The 4th Lucas number.
There are other significance and things that use the number that is to say;
7 deadly sins
7 classical planets (7 luminaries)
7 metals of antiquity
7 kings of Romes
7 Emperors of Rome; Julius Caesar, Augustus, Galba, Hadrian, Nerva, Sallust, Vespasian
7 hills of Istanbul
7 hills of Rome