Question

Which other numbers between 1 to 30 can be expressed as a product of two primes ?

Answer 1

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If I understand you correctly (which I realize I didn't), the answer is no. Take the number 30=2⋅3⋅530=2⋅3⋅5 for example. 66, 1010, and 1515 are also factors of 3030.

30=2⋅ 3⋅5=(2⋅3)⋅ 5=6⋅5=2⋅( 3⋅5)=2⋅ 15=(2⋅5)⋅3=10⋅3 30=2⋅3⋅5=(2⋅3)⋅5=6⋅5=2⋅(3⋅5)=2⋅15=(2⋅5)⋅3=10⋅3

Edit: After your clarification, I will change my answer to yes. See the fundamental theorem of arithmetic. It "states that any integer greater than 1 can be written as a unique product (up to ordering of the factors) of prime numbers." 

Answer 2

Answer:

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