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Assuming you mean positive whole numbers, then all numbers greater than 1 can be factorised using prime numbers only.

Some of the numbers are prime themselves, eg 2, 3, 5, 7 and so factorise into themselves; others are composite and so factorise into the product of 2 primes, eg 8 = 2 x 2 x 2, 12 = 2 x 2 x 3

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Q: What numbers less than 20 can be factorised with prime numbers only?
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