Introduced in the Year 5 curriculum as: "Measure and calculate the perimeter of composite rectilinear shapes in centimetres and metres"
A prime number has only 2 factors, itself and 1.
1 is not considered a prime number because it only has 1 factor - itself.
7 is a prime number, it only has factors of 1 and 7.
13 is a prime number, it only has factors of 1 and 13.
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