For which $ p$ prime numbers, there is an integer root of the polynominal $ 1 \plus{} p \plus{} Q(x^1)\cdot\ Q(x^2)\ldots\ Q(x^{2p \minus{} 2})$ such that $ Q(x)$ is a polynominal with integer coefficients?
To determine for which prime numbers \( p \) there exists an integer root of the polynomial \( 1 + p + Q(x^1) \cdot Q(x^2) \cdots Q(x^{2p-2}) \) such that \( Q(x) \) is a polynomial with integer coefficients, we proceed as follows:

1. **Key Lemma**: If \( x \equiv y \pmod{m} \), then \( Q(x) \equiv Q(y) \pmod{m} \). This lemma is crucial because it allows us to consider the polynomial \( Q(x) \) modulo \( m \).

2. **Case \( p \equiv 3 \pmod{4} \)**:
   - Assume, for the sake of contradiction, that there is an integer root \( x \).
   - Then we have:
     \[
     \prod_{i=1}^{2p-2} Q(x^i) \equiv \prod_{i=1}^{p-1} Q(x^i)^2 \pmod{p}
     \]
   - This implies:
     \[
     \prod_{i=1}^{p-1} Q(x^i)^2 + p + 1 \equiv y^2 + 1 \equiv 0 \pmod{p}
     \]
     for some integer \( y \).
   - Since \( p \equiv 3 \pmod{4} \), \( -1 \) is not a quadratic residue modulo \( p \). This leads to a contradiction.

3. **Case \( p \equiv 1 \pmod{4} \)**:
   - Assume, for the sake of contradiction, that there is an integer root \( x \).
   - We will reach a contradiction by considering modulo \( 4 \).

   **Subcase 1: \( x \) is odd**:
   - Then \( x^k \equiv x^{k+2} \pmod{8} \).
   - This implies:
     \[
     \prod_{i=1}^{2p-2} Q(x^i) + p + 1 \equiv Q(x)^{p-1} Q(x^2)^{p-1} + 2 \equiv y^2 + 2 \equiv 0 \pmod{4}
     \]
     for some integer \( y \).
   - Since \( 2 \) is not a quadratic residue modulo \( 4 \), this is a contradiction.

   **Subcase 2: \( x \) is divisible by \( 4 \)**:
   - Using \( Q(x^i) \equiv Q(0) \pmod{4} \), we have:
     \[
     \prod_{i=1}^{2p-2} Q(x^i) + p + 1 \equiv Q(0)^{2p-2} + 2 \equiv y^2 + 2 \equiv 0 \pmod{4}
     \]
     which is again a contradiction because \( 2 \) is not a quadratic residue modulo \( 4 \).

   **Subcase 3: \( x \equiv 2 \pmod{4} \)**:
   - We have:
     \[
     \prod_{i=1}^{2p-2} Q(x^i) + p + 1 \equiv Q(0)^{p-1} Q(2)^{p-1} + 2 \equiv y^2 + 2 \equiv 0 \pmod{4}
     \]
     which is again a contradiction because \( 2 \) is not a quadratic residue modulo \( 4 \).

4. **Case \( p = 2 \)**:
   - For \( p = 2 \), we need:
     \[
     Q(x) Q(x^2) = -3
     \]
     for some polynomial \( Q \).
   - Trying small cases, we find that \( x = -1 \) is a solution where \( Q(x) = 2x - 1 \).

Thus, the only prime number \( p \) for which there exists an integer root of the polynomial \( 1 + p + Q(x^1) \cdot Q(x^2) \cdots Q(x^{2p-2}) \) is \( p = 2 \).

The final answer is \( \boxed{ p = 2 } \).