Excluding 1, a factor of all whole numbers, use the 1st 7 prime numbers greater than 100 and multiply them together.
101 x 103 x 107 x etc
or
Any Prime number (except 2) to the 6th power has exactly seven factors, like 729 and 15625.
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Any prime number (greater than 3) to the 4th power has 5 factors, like 625 and 2401.
The number of combinations of six numbers that can be made from seven numbers will depend on if you can repeat numbers. In all there are over 2,000 different numbers that can be made.
Exactly one over seven 1 / 7 or one seventh
By looking for common factors - factors that appear in both numbers - and dividing both numbers by the same factor.
522 is composite. Composite numbers have over two factors and prime numbers have only two factors which is one and the number itself.