(0:01)Definition of Prime Numbers: Prime numbers have exactly two factorsâ€”1 and the number itself. 1 is not a prime number, and 2 is the smallest prime number.

(0:46)Common Prime Numbers: Remembering prime numbers below 20 (2, 3, 5, 7, 11, 13, 17, 19).

(0:58)Prime Factorisation: Expresses any number as a product of prime numbers. For example, 90 can be factorised $2 \times 3^2 \times 5$.

Methods of Prime Factorisation: Use the division method or create a factor tree to break down numbers visually into their prime factors.

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