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• Pre algebra
• Whole numbers
• Prime and composite numbers

# Prime and composite numbers

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•  Question 1: 1 pts The number 1 is neither prime nor composite.
•  Question 2: 1 pts $3$ is the smallest prime number.
•  Question 3: 1 pts
Number $87$ is a
number.
•  Question 4: 1 pts List all prime divisors of number $26.$
 $1,2,13$ $2,13$ $1,2,13,26$ $2,13,26$
•  Question 5: 2 pts How many even prime numbers are there?
 $0$ $1$ $2$ $3$
•  Question 6: 2 pts Which expression represents the difference between the largest three-digit prime number and the smallest two-digit prime number.
 $997-10$ $999-11$ $997-11$ $999-10$
•  Question 7: 2 pts List all prime numbers $p$ such that it is $p<20.$
 $2,3,5,7,11,12,13,17,19$ $2,3,5,7,9,11,13,17,19$ $1, 2,3,5,7,11,13,17,19$ $2,3,5,7,11,13,17,19$
•  Question 8: 2 pts List all prime numbers $p$ such that it is $80 \leq p \leq 90.$
 $82,83$ $83,89$ $89,90$ $81,89$
•  Question 9: 3 pts Find the smallest prime divisor of the number $133.$
 $1$ $2$ $7$ $19$
•  Question 10: 3 pts Which are two more numbers in the given order $4,9,25..?$
 $49,121$ $49,81$ $81,121$ $49,64$
•  Question 11: 3 pts The square of the prime number $p$ has exactly $3$ divisors: $1,p,p^{2}.$
•  Question 12: 3 pts Which number can be rest of the division of prime numbers $p>3$ with number $6.$
 $1,3$ $1,5$ $5,3$ $0,3$