$ ABCD$ is a $ 4\times 4$ square. $ E$ is the midpoint of $ \left[AB\right]$. $ M$ is an arbitrary point on $ \left[AC\right]$.  How many different points $ M$ are there such that $ \left|EM\right|\plus{}\left|MB\right|$ is an integer?

$\textbf{(A)}\ 2  \qquad\textbf{(B)}\ 3  \qquad\textbf{(C)}\ 4  \qquad\textbf{(D)}\ 5  \qquad\textbf{(E)}\ 6$
1. **Define the problem geometrically:**
   - Let \( ABCD \) be a \( 4 \times 4 \) square.
   - \( E \) is the midpoint of \( [AB] \), so \( E \) has coordinates \( (2, 4) \).
   - \( M \) is an arbitrary point on \( [AC] \). Since \( A \) is at \( (0, 0) \) and \( C \) is at \( (4, 4) \), the coordinates of \( M \) can be parameterized as \( (t, t) \) for \( t \) in the interval \([0, 4]\).

2. **Calculate distances \( |EM| \) and \( |MB| \):**
   - The distance \( |EM| \) is given by:
     \[
     |EM| = \sqrt{(t - 2)^2 + (t - 4)^2}
     \]
     Simplifying the expression inside the square root:
     \[
     |EM| = \sqrt{(t - 2)^2 + (t - 4)^2} = \sqrt{(t - 2)^2 + (t - 4)^2} = \sqrt{(t - 2)^2 + (t - 4)^2}
     \]
     \[
     = \sqrt{(t - 2)^2 + (t - 4)^2} = \sqrt{t^2 - 4t + 4 + t^2 - 8t + 16} = \sqrt{2t^2 - 12t + 20}
     \]
   - The distance \( |MB| \) is given by:
     \[
     |MB| = \sqrt{(4 - t)^2 + t^2}
     \]
     Simplifying the expression inside the square root:
     \[
     |MB| = \sqrt{(4 - t)^2 + t^2} = \sqrt{16 - 8t + t^2 + t^2} = \sqrt{2t^2 - 8t + 16}
     \]

3. **Sum the distances \( |EM| + |MB| \):**
   \[
   |EM| + |MB| = \sqrt{2t^2 - 12t + 20} + \sqrt{2t^2 - 8t + 16}
   \]

4. **Determine the range of \( |EM| + |MB| \):**
   - When \( t = 0 \):
     \[
     |EM| = \sqrt{2(0)^2 - 12(0) + 20} = \sqrt{20} = 2\sqrt{5}
     \]
     \[
     |MB| = \sqrt{2(0)^2 - 8(0) + 16} = \sqrt{16} = 4
     \]
     \[
     |EM| + |MB| = 2\sqrt{5} + 4
     \]
   - When \( t = 4 \):
     \[
     |EM| = \sqrt{2(4)^2 - 12(4) + 20} = \sqrt{32 - 48 + 20} = \sqrt{4} = 2
     \]
     \[
     |MB| = \sqrt{2(4)^2 - 8(4) + 16} = \sqrt{32 - 32 + 16} = \sqrt{16} = 4
     \]
     \[
     |EM| + |MB| = 2 + 4 = 6
     \]

5. **Identify integer values within the range:**
   - The range of \( |EM| + |MB| \) is from \( 4 \) to \( 4 + 2\sqrt{5} \).
   - The integer values within this range are \( 4, 5, 6, 7, 8 \).

6. **Count the number of different points \( M \):**
   - There are 5 integer values within the range.

The final answer is \( \boxed{5} \)