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Let $K=\Q(\theta)$ be an algebraic number field with $\theta$ a root of anirreducible quadrinomial $f(x) = x^6+ax^m+bx+c\in\Z[x] $ with$m\in\{2,3,4,5\}$. In the present paper, we give some explicit conditionsinvolving only $a,~b,~c$ and $m$ for which $K$ is non-monogenic. In each case,we provide the highest power of a rational prime $p$ dividing index of thefield $K$. In particular, we provide a partial answer to the Problem $22$ ofNarkiewicz \cite{Nar} for these number fields. Finally, we illustrate ourresults through examples.

ON the index divisors of certain number fields