is_page() relies on a complete global $wp_query object. If you call it before the action template_redirect has been fired, it might be impossible to get that data.
Wait for a proper action.
Example:
add_filter( 'template_include', function( $template ) {
if ( is_page( 27 ) )
echo 'this is the apply page';
return $template;
});
You can call is_page() in a loop too.
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