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Is it possible to find the digital sum of first hundred decimal digits of $\sqrt2$?

This question came to my mind when I was finding the digital sum i.e. the repeated sum of $1234^{5678}$ where I had to find $1234^{5678}$ (mod $9$) and then narrow down the remainder to $1$ digit.

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sure. Are you looking for an elegant solution? You can do that by brute force by using a computer. You can actually simply use the digits from here. – Michael Greinecker Jul 22 '12 at 11:07
If this is for Project Euler (for example, problem 80) you should add that as a tag. – Cocopuffs Jul 22 '12 at 11:11
What is project Euler? – Hyperbola Jul 22 '12 at 11:16
@Hyperbola : – Mathlover Jul 22 '12 at 19:21
If it's for Project Euler, it's off-limits; they have asked us not to discuss their questions here. – Gerry Myerson Jul 23 '12 at 0:06

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