It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 26 989 is not a prime number.
For example, 26 989 can be divided by 137: 26 989 / 137 = 197.
For 26 989 to be a prime number, it would have been required that 26 989 has only two divisors, i.e., itself and 1.
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26 989 is an odd number, because it is not evenly divisible by 2.
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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 26 989 is about 164.283.
Thus, the square root of 26 989 is not an integer, and therefore 26 989 is not a square number.
The square of a number (here 26 989) is the result of the product of this number (26 989) by itself (i.e., 26 989 × 26 989); the square of 26 989 is sometimes called "raising 26 989 to the power 2", or "26 989 squared".
The square of 26 989 is 728 406 121 because 26 989 × 26 989 = 26 9892 = 728 406 121.
As a consequence, 26 989 is the square root of 728 406 121.
The multiples of 26 989 are all integers evenly divisible by 26 989, that is all numbers such that the remainder of the division by 26 989 is zero. There are infinitely many multiples of 26 989. The smallest multiples of 26 989 are: