Is spiriva a form of steroids?

No. Spiriva contains no steroids. It is a medication which works to reduce the mucus production in the lungs and also helps to open up tight airways. It works by blocking certain receptors in the lungs (cholinergic receptors) which trigger these effects when activated.
No. Spiriva is in a class of medications termed anti-cholinergics. These medications when inhaled induce some bronchodilation as well as some "drying" of the airways. It is indicated for COPD and can help the productive cough and wheeze.