To check the CPU temperature, you should refer to BIOS/UEFI settings or use a trusted hardware monitor program. The monitoring program will be able to show the current CPU temperature, as well as many other details like processor load, fan speed, and clock speed. To find out if there are any problems with CPU temperature, it will be beneficial to compare the idle temperature of the CPU with the one that appears during intensive activities. In case the CPU temperature does not drop, try to see whether the fans work properly and whether there is dust in the vents.