6 is defined as a perfect number because the sum of the divisors of 6 (1,2,3,6) sum up to 12, which is twice 6. Equivalently, the sum of its proper divisors (1,2,3) is the number itself.
The origin of the phrase perfect number is unclear, but some theologians suggest it originates from The Bible, where God created the world in six days, with man on the sixth day.
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1,0002 = 1,000,000 so 1 less is 9992 = 998,001
22 is not a perfect number but 6, 28, 496 and 8128 are perfect numbers.
No, it is not a perfect number. The first four known perfect numbers are 6, 28, 496 and 8,128.
6 is the only perfect digit. The next perfect number is 28.
6 is the only single digit perfect number.