It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 26 397 is not a prime number.
For example, 26 397 can be divided by 3: 26 397 / 3 = 8 799.
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For 26 397 to be a prime number, it would have been required that 26 397 has only two divisors, i.e., itself and 1.
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26 397 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 26 397 is about 162.472.
Thus, the square root of 26 397 is not an integer, and therefore 26 397 is not a square number.
The square of a number (here 26 397) is the result of the product of this number (26 397) by itself (i.e., 26 397 × 26 397); the square of 26 397 is sometimes called "raising 26 397 to the power 2", or "26 397 squared".
The square of 26 397 is 696 801 609 because 26 397 × 26 397 = 26 3972 = 696 801 609.
As a consequence, 26 397 is the square root of 696 801 609.
The multiples of 26 397 are all integers evenly divisible by 26 397, that is all numbers such that the remainder of the division by 26 397 is zero. There are infinitely many multiples of 26 397. The smallest multiples of 26 397 are: