Answer 1984

What is formula to check if a number is prime or not? For example, 2,3,5,7,13, 19, 23... are prime numbers. But how to check for bigger numbers like 124 or 147 etc.? कोई संख्या अभाज्य है या नहीं, यह जांचने के लिए क्या सूत्र है? उदाहरण के लिए, 2,3,5,7,13, 19, 23 ... अभाज्य संख्याएँ हैं। लेकिन बड़ी संख्या जैसे 124 या 147 आदि की जांच कैसे करें?

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