Not all are Cesàro summable

It is well know that $G= 1 -1 +1 -1+1-1 +\cdots$ is Grandi Series which is divergent in nature. However, the series $G$ is Cesàro summable giving Cesàro sum $\frac{1}{2}$ . Now if we define a divergent series $C= 1+ 4 + 9 + 16 +\cdots$ Is it true that series $C$ is also Cesàro summable ? If yes, find the sum.