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Prime Factorisation

A prime number is a positiveinteger, larger than 1, which cannot be expressed as the product of two smaller positiveintegers.

Examples of prime numbers are 2 (the only even prime number), 3, 5, 7, 11, 13, 17, 19, 23 and 29.

Examples of numbers that are not prime numbers are 4 (as 2x2=4), 6 (as 3x3=4) and 8 (as 2x4=8).

To prime factorise a number means to write the number as a product of prime numbers.

Examples of Prime Factorisation of Numbers