2 x 2 x 2 x 5 = 40 or 23 x 51 = 40
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97 is a prime number. Thus its prime factorisation is itself: 97. (1 is NOT a prime number.)
7 is already prime; no factorization required.
The prime factorization of 87 is 3 x 29.The prime factorisation of 87 is 3 x 29.
Prime factorization.
The fundamental theorem of arithmetic or the unique factorisation theorem would fail.