Question

Now you might remember the names of the Seven Wonders, but do you know why 'seven' was such an auspicious number in ancient cultures?

Answer 1

seven was an auspicious number bacause it is known as the gods number
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Answer 2

Number seven have indifferent significance in the ancient cultures.  

Explanation:

In ancient times, when technology was not evolved people used to believed that god is prime creator of every existence of the world. Out of 10 prime numbers, seven is the most prime numbers. You can never multiply or divide with the group.

In ancient times, people perceived as a magic number in their daily lives. In bible, 7 numbers is known as perfection of spiritualism. There are 7 colors of the rainbow, 7 days a week and 7 major seas.