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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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Related questions

What Three prime numbers which multiply to make 225?

225 cannot be factorised into the product of only 3 prime numbers.


Why 2 is prime number?

two is a prime number because you can't put anything into two. think about it. Because the prime numbers can be divided only by 1 or the number itself. They cannot be factorised.


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No. There are only 4.


How to factorise a2 plus b2?

a2 + b2 cannot be factorised in real numbers, only in complex numbers. The fact that you ask this question indicates that you are nowhere near old enough to be studying complex numbers.a2 + b2 cannot be factorised in real numbers, only in complex numbers. The fact that you ask this question indicates that you are nowhere near old enough to be studying complex numbers.a2 + b2 cannot be factorised in real numbers, only in complex numbers. The fact that you ask this question indicates that you are nowhere near old enough to be studying complex numbers.a2 + b2 cannot be factorised in real numbers, only in complex numbers. The fact that you ask this question indicates that you are nowhere near old enough to be studying complex numbers.


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