First you have to identify the RFID standrad implemented by the chip. ISO/IEC 14443 (13.56 MHz) would be a promising candidate, but is may be also a low frequency (e.g. 125 kHz) standard, or some less common protocol. A 13.56 MHz standard would be most simply identified by trying to read out the chip with a multiprotocol RFID reader.You may want to use a grid dipper or an equivalent measurement circuit to check, if the part shows a RF resonance at a certain frequency.
You're possibly not able to read out all data stored in the chip, because it may implement security features. But it should at least identify with a serial number. The chip may be also read-only, not intended to write any data.