Are there positive integers $a, b, c$, such that the numbers $a^2bc+2, b^2ca+2, c^2ab+2$ be perfect squares? 
1. We are given the expressions \(a^2bc + 2\), \(b^2ca + 2\), and \(c^2ab + 2\) and need to determine if there exist positive integers \(a, b, c\) such that all three expressions are perfect squares.

2. First, observe that for any integer \(n\), \(n^2 \equiv 0 \text{ or } 1 \pmod{4}\). This is because:
   - If \(n\) is even, \(n = 2k\) for some integer \(k\), then \(n^2 = (2k)^2 = 4k^2 \equiv 0 \pmod{4}\).
   - If \(n\) is odd, \(n = 2k+1\) for some integer \(k\), then \(n^2 = (2k+1)^2 = 4k^2 + 4k + 1 \equiv 1 \pmod{4}\).

3. Since \(a, b, c\) are positive integers, we need to consider their parity. If \(a, b, c\) are all odd, then \(a \equiv 1 \pmod{2}\), \(b \equiv 1 \pmod{2}\), and \(c \equiv 1 \pmod{2}\).

4. Now, consider the expression \(a^2bc + 2\):
   - Since \(a, b, c\) are odd, \(a^2 \equiv 1 \pmod{4}\), \(b \equiv 1 \pmod{4}\), and \(c \equiv 1 \pmod{4}\).
   - Therefore, \(a^2bc \equiv 1 \cdot 1 \cdot 1 = 1 \pmod{4}\).
   - Thus, \(a^2bc + 2 \equiv 1 + 2 = 3 \pmod{4}\).

5. Similarly, for the other two expressions:
   - \(b^2ca + 2 \equiv 1 \cdot 1 \cdot 1 + 2 = 3 \pmod{4}\).
   - \(c^2ab + 2 \equiv 1 \cdot 1 \cdot 1 + 2 = 3 \pmod{4}\).

6. For a number to be a perfect square, it must be congruent to \(0\) or \(1 \pmod{4}\). However, we have shown that \(a^2bc + 2 \equiv 3 \pmod{4}\), \(b^2ca + 2 \equiv 3 \pmod{4}\), and \(c^2ab + 2 \equiv 3 \pmod{4}\).

7. Since \(3 \pmod{4}\) cannot be a perfect square, it is impossible for \(a^2bc + 2\), \(b^2ca + 2\), and \(c^2ab + 2\) to all be perfect squares simultaneously.

Therefore, there are no positive integers \(a, b, c\) such that \(a^2bc + 2\), \(b^2ca + 2\), and \(c^2ab + 2\) are all perfect squares.

The final answer is \(\boxed{\text{No}}\).