31 (number) facts for kids
Thirty-one is a special number. It's found right after thirty and just before thirty-two. It's also an odd number, which means you can't divide it evenly by two.
What Makes 31 Special?
The number 31 is interesting for a few reasons in mathematics. It's known as a prime number, and it also has specific factors.
31: A Prime Number
Thirty-one is a special kind of number called a prime number. A prime number is a whole number that is greater than 1 and can only be divided evenly by two numbers: 1 and itself. Think of it like this: you can't break 31 down into smaller whole number parts by multiplying other numbers together (except 1 times 31).
Thirty-one is the 11th prime number in order. The prime numbers that come before it are:
Factors of 31
The factors of a number are the numbers that divide into it exactly, without leaving any remainder. For the number 31, there are only two factors. These are 1 and 31. This is another way to show that 31 is a prime number, because prime numbers always have only two factors: 1 and themselves.
