The mass of the object does not change by moving it to another place. Mass is in the variant of the body. At the centre of the earth, the net gravitational force is zero, so the weight will be zero, but its masses will remain the same.
Mass can never be zero.
Mass is a scalar quantity. It has magnitude.
Mass is commonly measured in kilograms and grams.
Hence, at the centre of Earth, the mass will be the same.