Is a GB Gigabyte bigger than a MB Megabyte

The answer is yes.

Megabyte is a multiple of the unit byte for digital info with prefix mega (10⁶). The unit symbol of megabyte is MB. 1 megabyte consists of one million bytes of information. In binary base, one megabyte is equal to 1,048,576 bytes.

Gigabyte is a multiple of the unit byte for digital information with prefix giga (10⁹). The unit symbol of gigabyte is GB. 1 gigabyte consists of 1,000,000,000 bytes of digital info. In binary base, one gigabyte is equal to 1,073,741,824 bytes. 

1 Megabyte is considered to be equal to 0.001 gigabytes in decimal and 0.0009765625 gigabytes in binary system. 

1 Gigabyte is considered to be equal to 1000 megabytes in decimal and 1024 megabytes in binary system.

As you can see, 1 Gigabyte is 1000 times bigger than a Megabyte. So, a GB is bigger than a MB.