It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 104 521 is not a prime number.
For example, 104 521 can be divided by 127: 104 521 / 127 = 823.
For 104 521 to be a prime number, it would have been required that 104 521 has only two divisors, i.e., itself and 1.
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104 521 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 104 521 is about 323.297.
Thus, the square root of 104 521 is not an integer, and therefore 104 521 is not a square number.
The square of a number (here 104 521) is the result of the product of this number (104 521) by itself (i.e., 104 521 × 104 521); the square of 104 521 is sometimes called "raising 104 521 to the power 2", or "104 521 squared".
The square of 104 521 is 10 924 639 441 because 104 521 × 104 521 = 104 5212 = 10 924 639 441.
As a consequence, 104 521 is the square root of 10 924 639 441.
The multiples of 104 521 are all integers evenly divisible by 104 521, that is all numbers such that the remainder of the division by 104 521 is zero. There are infinitely many multiples of 104 521. The smallest multiples of 104 521 are: