Married is a past participle (not a simple past) employed as an adjective. The sentence is in the present tense, marked by the present form are.
Past participles of transitive verbs are employed in passive constructions (BE + past participle), so they very readily come to be used as adjectives describing the state which is imposed by the action of the verb.
For instance, if I lost my keys yesterday, this may be expressed in the passive by saying that my keys were lost yesterday. Today (unless I find them again) I may say that my keys are lost; this is no longer a passive event but a description of my keys: they are in a 'lost' state. And when I do find my keys again I will be able to say that they are found.
Likewise, if two people marry each other we may narrate the event as a passive: Jack and Susan were married yesterday†; but the consequence is that they are now in the 'married' state, and we say that they are married.
† Lambie points out that with marry the passive version is not in present-day English an ordinary transformation of the active: they were not married by each other, but by a third party: "Jack and Susan were married by Rev. Blovious". But the passive does nonetheless give rise to expressing the state they now enjoy as married.
Best Answer
In that sentence, it is an adjective.
Adj. 1. few - a quantifier that can be used with count nouns and is often preceded by `a'; a small but indefinite number; "a few weeks ago"; "a few more wagons than usual"