It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 102 521 is not a prime number.
For example, 102 521 can be divided by 157: 102 521 / 157 = 653.
For 102 521 to be a prime number, it would have been required that 102 521 has only two divisors, i.e., itself and 1.
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102 521 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 102 521 is about 320.189.
Thus, the square root of 102 521 is not an integer, and therefore 102 521 is not a square number.
The square of a number (here 102 521) is the result of the product of this number (102 521) by itself (i.e., 102 521 × 102 521); the square of 102 521 is sometimes called "raising 102 521 to the power 2", or "102 521 squared".
The square of 102 521 is 10 510 555 441 because 102 521 × 102 521 = 102 5212 = 10 510 555 441.
As a consequence, 102 521 is the square root of 10 510 555 441.
The multiples of 102 521 are all integers evenly divisible by 102 521, that is all numbers such that the remainder of the division by 102 521 is zero. There are infinitely many multiples of 102 521. The smallest multiples of 102 521 are: