The year 2013 has just started and while writing a check or holiday cad you may have noticed that 2013 is odd. It ends with 13 that many would rather skip. It contains all the digits in a range of 0-3 with no repetitions, however it is not a number you would call beautiful. Definitely odd. Perhaps even prime...

Is it prime?

Nope, 2013 is divisible by 11, 3 and 61!

Dare to take a quiz about prime numbers?

If you need some muscle-buildup before the quiz, here is an article about recent prime year 2011 I wrote for The Boston Globe: 2011 is a sexy prime.

Ready for the Quiz?

Here we go:

Is it prime?

Nope, 2013 is divisible by 11, 3 and 61!

Dare to take a quiz about prime numbers?

If you need some muscle-buildup before the quiz, here is an article about recent prime year 2011 I wrote for The Boston Globe: 2011 is a sexy prime.

Ready for the Quiz?

Here we go:

- 1.

1.

__Puzzle #1: Prime Olympics__
True or false: Number of rings in the Olympic emblem is prime.

**Answer: True, there are 5 rings and 5 is a rime**

**number.**

2.

__Puzzle #2: Leap Prime__
True or false: Leap year cannot be a prime number year.

**Answer: true, leap year numbers are divisible by 4.**

3.

__Puzzle #3: Infiltrator__
Which of the following four numbers is not a prime: 1, 37, 911, 991.

**Answer: 1 is not prime because prime should**

**have two different divisors: 1 and itself. However, long time ago 1 was considered to be a prime.**

4.

__Puzzle #4: What are primes?__
Which one of the following is a correct definition of a prime number:

–

- Odd number ending with 1, 3, 5, or 7.
- Any number present in the multiplication table. Multiplication table is a “base” of all the numbers.
- Number that can be divided by only two distinct divisors.
- Number that looks the same left-to-right and right-to-left.

**Answer: #3.**

5.

__Puzzle #5: Prime Flowers.__
True or false: Number of petals in any flower is always prime.

**Answer: false. There are 4 petal flowers, 4 is not a prime.**

6.

__Puzzle #6: Even Primes__
True or false: No even number is prime because all even numbers are divisible by 2 in addition to divisors of 1 and itself.

**Answer: this is false because 2 is a prime number. The only even prime. It is divisible by 1 and 2.**

7.

__Puzzle #7: Math Magic__
True or False: This trick can only be done in the prime year such as 2011: Take the age you were in 2011, add the last two digits of the year you were born and get a number that ends with 11 or 111.

**Answer:**

**This trick will work for any year that ends with**

**11 such as 1911. And 1911 is not prime: 1911 = 3 x 7 x 7 x 13 Therefore the magic statement is false.**

**In general, i**

**f you add**

**your age to the year you are born you will always get current year. So in 2011 it will end with 11, as well as in 1911 and 3311.**

8.

__Puzzle #8: Prime Senate.__
Number of Democrats in the US Senate is a prime number as well as the number of Republicans in the US Senate.

**Answer: This is true. There are 47 Democrats and 53 Republicans currently in US Senate**.

9.

__Puzzle #9: Prime 108__
True or false: Famous “Prime 108” restaurant in Nashville, TN located in the Union Station is named after prime number 108 that is the number of entries on their menu.

**Answer: false. 108 is not a prime number (108=54x2).**

**The restaurant is named for a Bully 108, the first steam engine to chug through Union Station, and "prime"**

**alludes to the high-quality ingredients used to compose the dishes.**

10.

__Puzzle #10 A Special Year.__
True or false: Current year is rather special. It is prime in the Gregorian calendar – year 2013; prime in the Islamic calendar – year 1434. And prime in the Hebrew calendar – 5773.

**Answer: false. 2013, 5773 and 1434 are not prime numbers.**

**This quiz was created by TheMathMom for the Boston Globe in 2011. Link.**

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