To simplify the expression \((6^2)^4\), you can use the power of a power property of exponents, which states that \((a^m)^n = a^{m \cdot n}\).
Here, \(a = 6\), \(m = 2\), and \(n = 4\).
Using the property:
\[ (6^2)^4 = 6^{2 \cdot 4} = 6^8 \]
Now, \(6^8\) can be calculated, but it's already simplified as an expression. If you want to compute \(6^8\):
\[ 6^8 = 1679616 \]
So, the simplified expression is \(6^8\), or numerically, \(1679616\).