Current is a scalar quantity, it is justified by the following two observations -
(i) If current carrying wire is bent at some point, then also current in the wire remains same, while a vector quantity always changes by changing its direction.
(ii) Current flowing in the circuit do not follow the laws of vector addition. It follows according to ordinary rule of algebra. This makes it clear that current is not a vector but a scalar quantity. Also current is defined as rate of flow of charge through the wire .