Yes, because their only common factor is 1.
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1, 5, 43, 215 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 27, 36, 54, 72, 108, 216
A set of numbers whose GCF is one are called co-prime or relatively prime
Depending on what version it is, The Boy in the Striped Pyjamas by John Boyne is 215 pages long. On one Spanish version, it is 219 pages long.
Such numbers are relatively prime, or co-prime.
Two numbers are co-prime if they do not have any common factors. The numbers themselves need not be prime.