Number Theory
Primes and Composites
Interactive practice questions
Which ONE of the following describes a prime number?
A natural number that has a factor of $1$1.
A
A natural number that has at most two factors: itself and $1$1.
B
A natural number greater than $1$1 that has exactly two factors: itself and $1$1.
C
A natural number greater than $1$1 that has more than two factors.
D
Easy
< 1min
Which ONE of the following describes a composite number?
Easy
< 1min
True or False?
$54$54 is a prime number.
Easy
< 1min
True or False?
79 is a prime number.
Easy
< 1min
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