Yes, the number "18000" is a rational number as you can express "18000" in the form of p/q; where p and q are integers and, q is not equal to “0”.
\[\begin{align}
& 18000=\frac{18000}{1} \\
& =\frac{p}{q},\text{where}\ p=18000,\ q=1\left( \ne 0 \right)
\end{align}\]
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