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# Prime Numbers

2, 3, 5, 7, ... The set of prime numbers is the alphabet of mathematics that allows us to communicate across the universe.

What is the next prime number in this sequence:

\[2, 3, 5, 7, 11, 13, \underline{\quad}, \ldots ? \]

True or false: the number \( 47 \) is prime.

Which of the following numbers is prime?

\[A, \hspace{0.5cm} A+2, \hspace{0.5cm} A+4\]

If \(A>3,\) can all three numbers above be prime?

True or false: the number \( 21 \) is prime.

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