Below is the code to get Magento store id, store code, store name, etc.

Get store data
Mage::app()->getStore();

Store Id
Mage::app()->getStore()->getStoreId();

Store code
Mage::app()->getStore()->getCode();

Website Id
Mage::app()->getStore()->getWebsiteId();

Store Name
Mage::app()->getStore()->getName();

Is Active
Mage::app()->getStore()->getIsActive();

Store Home Url
Mage::app()->getStore()->getHomeUrl();

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