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East Africa p.6 Math
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8. Prime numbers

A whole number is a prime if it is larger than \(1\) and the only whole numbers that divide it are \(1\) and itself.

Example Which of the numbers from \(1\) to \(10\) are prime?

Solution \(\downarrow\)
\(1\) is not prime since it is not larger than \(1\)
\(2\) is prime since only \(1\) and \(2\) divide \(2\)
\(3\) is prime since only \(1\) and \(3\) divide \(3\)
\(4\) is not prime since \(2\) divides \(4\)
\(5\) is prime since only \(1\) and \(5\) divide \(5\)
\(6\) is not prime since \(2\) divides \(6\)
\(7\) is prime since only \(1\) and \(7\) divide \(7\)
\(8\) is not prime since \(2\) divides \(8\)
\(9\) is not prime since \(3\) divides \(9\)
\(10\) is not prime since \(2\) divides \(10\)

Is this a prime number?

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