Originally Posted by
Soroban Hello, Don!
Do you understand that $\displaystyle x|y$ means "$\displaystyle x\text{ divides }y$" ?
Since every number divides itself, your diagram is correct . . . so far.
But you missed a few others . . .
. . 2 divides 4, 2 divides 6, 2 divides 8.
. . 3 divides 6.
. . 4 divides 8.
You should have arrows indicating those pairs, too:
.$\displaystyle \begin{array}{ccc}& & 4 \\ & \nearrow & \\ 2 & \rightarrow & 6 \\ & \searrow & \\ & & 8 \end{array}\qquad \text{and }\;3\to6\qquad \text{and }\;4\to8$