This paper was retracted by the publisher as it has numerous unfixable errors. In particular, the main result of the paper, Corollary 3.10, is unfortunately false.
"[RETRACTION] A Note on Number Knots and the Splitting of the Hilbert Class Field." Taiwanese J. Math. 24 (2) 283 - 300, April, 2020. https://doi.org/10.11650/tjm/190703