As a product of its prime factors in exponents: 2^4 times 3^2 = 144
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53 and 2 are both prime numbers and their LCM is 106
42240 is not prime because it can go into other numbers besides 1 and 42240.
Prime factorization of 26 makes it much clear. 26 = 2x13. Both 13 and 2 go into 26.
Itself and one because 113 is a prime number
168