This depends on if you can reuse a number or not, and if the order of the numbers are important. See the related link for more information on how to determine.
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The numbers which cannot be made into a fraction are the irrational numbers.
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.
Any number that can be made into a fraction is called a rational number, which also means it is a real number.
Real numbers are madeup of rational and irrational numbers
A number that is not a prime number is called a composite number because it can be made by multiplying prime numbers together. For example, 6 is a composite number that is the product of multiplying the prime numbers 2 and 3 together.