It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 38 491 is not a prime number.
For example, 38 491 can be divided by 61: 38 491 / 61 = 631.
For 38 491 to be a prime number, it would have been required that 38 491 has only two divisors, i.e., itself and 1.
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38 491 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 38 491 is about 196.191.
Thus, the square root of 38 491 is not an integer, and therefore 38 491 is not a square number.
The square of a number (here 38 491) is the result of the product of this number (38 491) by itself (i.e., 38 491 × 38 491); the square of 38 491 is sometimes called "raising 38 491 to the power 2", or "38 491 squared".
The square of 38 491 is 1 481 557 081 because 38 491 × 38 491 = 38 4912 = 1 481 557 081.
As a consequence, 38 491 is the square root of 1 481 557 081.
The multiples of 38 491 are all integers evenly divisible by 38 491, that is all numbers such that the remainder of the division by 38 491 is zero. There are infinitely many multiples of 38 491. The smallest multiples of 38 491 are: