• 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 $6.$

    $1,3$

    $1,5$

    $5,3$

    $0,3$