The GCD of given numbers is 2.
Step 1 : Find prime factorization of each number.
$$\begin{aligned}3566 =& 2\cdot1783\\[8pt]3444 =& 2\cdot2\cdot3\cdot7\cdot41\\[8pt]\end{aligned}$$(view steps on how to factor 3566 and 3444. )
Step 2 : Put a box around factors that are common for all numbers:
$$\begin{aligned}3566 =& \color{blue}{\boxed{2}}\cdot1783\\[8pt]3444 =& \color{blue}{\boxed{2}}\cdot2\cdot3\cdot7\cdot41\\[8pt]\end{aligned}$$Step 3 : Multiply the boxed numbers together:
$$ GCD = 2 $$This solution can be visualized using a Venn diagram.
The GCD equals the product of the numbers at the intersection.