No, a charged particle moving with a constant speed does not produce an electromagnetic wave. According to classical electrodynamics, the production of electromagnetic waves is associated with the acceleration of charged particles, not with their constant velocity.
When a charged particle accelerates, it undergoes changes in velocity, and this changing velocity produces oscillating electric and magnetic fields that propagate through space as an electromagnetic wave. These waves carry energy and information.
However, if a charged particle is moving with a constant velocity, its electric and magnetic fields are static and do not change over time. Consequently, no electromagnetic waves are generated.
To generate electromagnetic waves, the charged particle needs to accelerate or decelerate, which leads to the emission of radiation in the form of electromagnetic waves. This principle is the basis for many phenomena and technologies involving electromagnetic radiation, such as radio waves, light, and other forms of electromagnetic waves.