Yes, you can take protein powder without exercising, but it depends on your diet and health goals.
Protein is essential for muscle repair, hormone production, and overall cell function. If you're not getting enough protein from food (especially for vegetarians, elderly people, or during recovery from illness), supplements can help fill the gap.
However, taking too much without increased activity may lead to weight gain. For non-active individuals, focus on balanced intake rather than high doses.
In short, protein powder is safe without workouts, but it should match your daily nutritional needs.