Is 1991 a prime number? What are the divisors of 1991?

## Parity of 1 991

1 991 is an odd number, because it is not evenly divisible by 2.

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## Is 1 991 a perfect square number?

A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 1 991 is about 44.621.

Thus, the square root of 1 991 is not an integer, and therefore 1 991 is not a square number.

## What is the square number of 1 991?

The square of a number (here 1 991) is the result of the product of this number (1 991) by itself (i.e., 1 991 × 1 991); the square of 1 991 is sometimes called "raising 1 991 to the power 2", or "1 991 squared".

The square of 1 991 is 3 964 081 because 1 991 × 1 991 = 1 9912 = 3 964 081.

As a consequence, 1 991 is the square root of 3 964 081.

## Number of digits of 1 991

1 991 is a number with 4 digits.

## What are the multiples of 1 991?

The multiples of 1 991 are all integers evenly divisible by 1 991, that is all numbers such that the remainder of the division by 1 991 is zero. There are infinitely many multiples of 1 991. The smallest multiples of 1 991 are:

## Numbers near 1 991

### Nearest numbers from 1 991

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