what do you call a number that cannot be arranged into 2-row arrays?

odd numbers. I learned this from Roger.

2+2=

To answer the first question, a number that cannot be arranged into 2-row arrays is called an odd number. Odd numbers are integers that cannot be evenly divided by 2, leaving no remainder. They are the numbers that are not divisible by 2.

To get the answer to the second question, you can simply perform the arithmetic operation of addition. Adding 2 and 2 together would result in 4.