How do you know if a number is a prime number?
How do you know if a number is a prime number? In this video, I’ll teach you two clear and effective methods to check whether a number is prime or not.
🟢 What is a Prime Number?
A prime number is a natural number greater than 1 that has only two positive divisors: 1 and itself.
✅ Method 1: Trial Division (Best for checking one number)
✅ Method 2: The Sieve of Eratosthenes (Best for finding all primes up to a limit)
I explain both methods step by step with clear examples so you can understand easily — perfect for high school students, math lovers, or anyone interested in number theory.
Whether you're preparing for exams or just love math, these techniques are essential!
Drop a number in the comments and I’ll tell you if it’s prime or not! 👇
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