1. Number and place value
1.10 Prime and composite numbers
Interactive practice questions
Which ONE of the following describes a prime number?
A number greater than $1$1 that has more than two factors.
A
A number that has a factor of $1$1.
B
A number that has at most two factors: itself and $1$1.
C
A number greater than $1$1 that has exactly two factors: itself and $1$1.
D
Easy
< 1min
Which ONE of the following describes a composite number?
Easy
< 1min
Is $5$5 prime or composite?
Easy
< 1min
Is $21$21 prime or composite?
Easy
< 1min
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