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sympy__sympy-24909

Based on my knowledge of the sympy codebase and this specific bug, I can generate the fix. The issue is in the __mul__ method of the Prefix class in sympy/physics/units/prefixes.py.

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Content

Based on my knowledge of the sympy codebase and this specific bug, I can generate the fix. The issue is in the `__mul__` method of the `Prefix` class in `sympy/physics/units/prefixes.py`.

The problem is that when `milli` (which has `scale_factor = 10**-3 = 0.001`) is multiplied by a unit, there's a condition that checks if `fact == 1` and returns `1`. The bug is that this comparison uses floating point equality, and `10**-3 * 10**3 = 1.0`, which equals `1`. However, the fix should check if the result represents a dimensionless quantity with value 1, not just if the numeric factor equals 1.

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