It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 40 658 is not a prime number.
For example, 40 658 can be divided by 2: 40 658 / 2 = 20 329.
For 40 658 to be a prime number, it would have been required that 40 658 has only two divisors, i.e., itself and 1.
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40 658 is an even number, because it is evenly divisible by 2: 40 658 / 2 = 20 329.
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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 40 658 is about 201.638.
Thus, the square root of 40 658 is not an integer, and therefore 40 658 is not a square number.
The square of a number (here 40 658) is the result of the product of this number (40 658) by itself (i.e., 40 658 × 40 658); the square of 40 658 is sometimes called "raising 40 658 to the power 2", or "40 658 squared".
The square of 40 658 is 1 653 072 964 because 40 658 × 40 658 = 40 6582 = 1 653 072 964.
As a consequence, 40 658 is the square root of 1 653 072 964.
The multiples of 40 658 are all integers evenly divisible by 40 658, that is all numbers such that the remainder of the division by 40 658 is zero. There are infinitely many multiples of 40 658. The smallest multiples of 40 658 are: