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Primary numbers, also known as prime numbers, are numbers that are only divisible by 1 or itself. For instance, 1, 2, 3, 5 and 7 are primary numbers because dividing any of them by other numbers besides 1 or itself would produce a remainder. Non-primary numbers, such as 4, 6, 8 and 9 are known as composite numbers. They can be divided by multiples and reduced to lowest terms in fractions.

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Q: What are primary numbers?
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