Can I change Dell Inspiron 3264 Processor?
If yes can I set intel core i5 7200?
These use FCBGA CPUs - soldered to the board, so the only way to upgrade is by replacing the entire system board, assuming one is available with the CPU you want.
Beyond voiding your warranty (which replacing the board will do), this will be a very expensive upgrade.
You can bet the cost of a board + i5 CPU will run north of $300-400 just for the part - add in the labor and it's not a practical upgrade.