How to remove the product title

Where ?

In most of the cases some CSS should do but it will differ based on where you want to remove it...

You can edd the CSS below in the hikashop CSS via the interface we provide in the config under the tab display in the CSS area:
.hikashop_product_name_main{
display: none;
}

Yes. That's it.

Could you give the URL to that page so that we can see ?

Then, maybe you could send it via our contact form ?

We had a look at your website.
You are still using the "default" CSS file instead of the "custom" CSS file for your front end.
So the modification you made in the "custom" file is not used.
You can see the file used in the HTML of your pages:

<link rel="stylesheet" href="/~furlessc/media/com_hikashop/css/frontend_default.css" type="text/css">

Happy easter too !

I just checked your website and I don't see the titles on your product pages.

There seems to be some javascript code from your template which changes the span tags inside h2 tags:

do_nothing( function() {
var modules = ['rt-block'];
var header = ['h3','h2','h1'];
GantryBuildSpans(modules, header);
}); 

By the way, if you want to circumvent easily the problem, instead of using CSS to hide the product name, you could edit the file show of the view product via the menu Display>Views and remove the code :
echo $this->element->product_name;
and the code:
echo $variant->product_name;

That way the product name won't be displayed by PHP at all.

That code is in charge of displaying the product name. If you remove it that will remove the name...
You should put it back and instead remove its equivalent:
echo $this->element->product_code;
and:
echo $variant->product_code;