How can I find out how many individuals are inputted onto our civi system
Simplest way :


menu Search -> Find Contacts
is - any contact type - -> replace by the contact type you want to count (Household or Individual)
click Search button


In the result, you will see the total count (here 1238 individual contacts) :



You can use another search to have more criteria and get the total count for each. The search result will always show you the total count.