Trade existed prior to capitalism and isn't dependent on it. It also existed within communist/socialist countries (although not always very effectively). Capitalism refers to the means of production being owned by someone who does not personally use them but employs others to do so with the primary goal of producing profit for the owner. When the means of production are owned by the people employing them, or the primary goal of controlling the means of production is not profit, you don't have capitalism.

e.g. feudalism wasn't capitalism because although the means of production were not owned by those who worked them, the primary goal was the consolidation of political power within the government, not profit.