To accurately review the number of CPU Cores on your machine, there are 2 methods. You may use either the System Report or Terminal method:

System Report:

For MacOS Monterey and older:

1. Navigate towards the top left corner of your screen and click the Apple Logo
2. Click "About this mac" > "System Report" > "Hardware"
3. The number of CPU Cores should be listed in the Hardware overview, to the right of "Total number of Cores"

For MacOS Ventura:

1. Navigate towards the top left corner of your screen and click the Apple Logo
2. Click "More Info"
3. Scroll to the bottom of the "About" page
4. Click "System Report" > "Hardware"
5. The number of CPU cores should be listed in the Hardware overview, to the right of "Total number of Cores"

In both cases, the output will resemble like so:

Terminal:

1. Launch the "Terminal" Application
2. Type and enter the command:  sysctl -n hw.ncpu
3. The resulting output will provide the number of cores

Upon entering the command, the terminal output result in the number of cores like so: