Find the least $k$ for which the number $2010$ can be expressed as the sum of the squares of $k$ integers.
1. **Assume that 2010 can be written as the sum of 2 squares.**
   - We need to check if \(2010\) can be expressed as \(x^2 + y^2\) for some integers \(x\) and \(y\).
   - Consider the equation \(x^2 + y^2 = 2010\).

2. **Check the congruence modulo 3:**
   - Since \(2010 \equiv 0 \pmod{3}\), we have \(x^2 + y^2 \equiv 0 \pmod{3}\).
   - The quadratic residues modulo 3 are 0 and 1. Therefore, \(x^2 \equiv 0 \pmod{3}\) and \(y^2 \equiv 0 \pmod{3}\).
   - This implies that both \(x\) and \(y\) must be divisible by 3.

3. **Check the divisibility by 9:**
   - If \(x\) and \(y\) are both divisible by 3, then \(x = 3a\) and \(y = 3b\) for some integers \(a\) and \(b\).
   - Substituting into the equation, we get \(9a^2 + 9b^2 = 2010\), which simplifies to \(a^2 + b^2 = 223.33\).
   - Since \(223.33\) is not an integer, this is a contradiction. Therefore, \(k = 2\) is impossible.

4. **Check for \(k = 3\):**
   - We need to find integers \(x, y, z\) such that \(x^2 + y^2 + z^2 = 2010\).
   - By trial and error or systematic search, we find that \(5^2 + 7^2 + 44^2 = 25 + 49 + 1936 = 2010\).

Therefore, the least \(k\) for which 2010 can be expressed as the sum of the squares of \(k\) integers is \(k = 3\).

The final answer is \(\boxed{k=3}\).