Direct answer: No, earthquakes cannot be predicted. Meaning we cannot predict specific information: "when, where, and how big." This is disappointing to many but reflects current understanding limits in seismology.
What we can do: Seismologists can do probabilistic risk assessment. Like "there's a 30% probability of a magnitude 7.0+ earthquake in this region in the next 50 years." But this is "risk assessment," not "prediction."
Why we can't predict: Earthquakes result from complex physics. Plate movements are unpredictable on yearly scales, and whether small earthquakes trigger major ones is unpredictable. Currently, deterministic prediction is physically impossible.
Warnings vs forecasts: Prediction is impossible, but sending warnings immediately after earthquakes is possible. Seconds to tens of seconds after seismic detection, we can issue warnings and tsunami alerts. This is "early warning systems."
Preparedness is key: Since earthquake prediction is impossible, preparedness and response are most important.