what do we call the numbers that cannot be arranged into 2-row arrays?

odd numbers

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what do we call the numbers that cannot be arranged into 2-row arrays

The numbers that cannot be arranged into 2-row arrays are called "odd numbers".

To determine if a number is odd, you can use a simple rule: an odd number is any integer that is not divisible evenly by 2. In other words, if you divide an odd number by 2, you will always have a remainder of 1.

For example:
- 1 is an odd number because 1 divided by 2 equals 0 with a remainder of 1.
- 3 is an odd number because 3 divided by 2 equals 1 with a remainder of 1.
- 5 is an odd number because 5 divided by 2 equals 2 with a remainder of 1.

On the other hand, even numbers can be arranged into 2-row arrays. These are numbers that are divisible evenly by 2, meaning they have a remainder of 0 when divided by 2.

For example:
- 2 is an even number because 2 divided by 2 equals 1 with no remainder.
- 4 is an even number because 4 divided by 2 equals 2 with no remainder.
- 6 is an even number because 6 divided by 2 equals 3 with no remainder.

So, in summary, odd numbers cannot be arranged into 2-row arrays because they cannot be divided evenly by 2, resulting in a remainder of 1.