Question

Which number is a prime number?A.4B.6C.7D.9

Answer 1

Explanation

Prime numbers are divisible only by the number 1 or itself and t o prove whether a number is a prime number, first try dividing it by 2, and see if you get a whole number. If you do, it can't be a prime number. If you don't get a whole number, next try dividing it by prime numbers

so

Step 1

prove 4

$\frac{4}{2}=2\rightarrow whole\text{ number, so 4 is not prime}$

Step 2

prove 6

$\begin{gathered} 6 \\ \frac{6}{2}=3\rightarrow whole\text{ numer, so 6 is not a prime number} \end{gathered}$

Step 3

prove 7

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