Is $13$13 prime or composite?

$13$13 is a composite number.

A

$13$13 is a prime number.

B

Easy

< 1min

Is $15$15 prime or composite?

Easy

< 1min

True or False?

$54$54 is a prime number.

Easy

< 1min

Is $77$77 prime or composite?

Easy

< 1min

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Identify and describe properties of prime, composite, square and triangular numbers.