Compute the sum $\sum _{k=1}^{10000}\frac{1}{k}$ and $\sum _{k=1}^{100000}\frac{1}{k}$. Are there any differences?

Compute the sum $\sum _{k=1}^{100000}\frac{1}{{k}^{2}}$ and $\sum _{k=1}^{1000000}\frac{1}{{k}^{2}}$. Are there any differences?

Compute the sum $\sum _{k=1}^{100000}\frac{1}{{k}^{2}}$ and $\sum _{k=1}^{1000000}\frac{1}{{k}^{2}}$. Are there any differences?