The very first example of code in SICP is a non-list primitive type:<p><pre><code>    &gt; One kind of primitive expression you might type is a number. (More precisely,
    &gt; the expression that you type consists of the numerals that represent the number
    &gt; in base 10.) If you present Lisp with a number
    &gt; 
    &gt; 486
    &gt; 
    &gt; the interpreter will respond by printing5
    &gt; 
    &gt; 486</code></pre>