It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 10 421 is not a prime number.
For example, 10 421 can be divided by 17: 10 421 / 17 = 613.
For 10 421 to be a prime number, it would have been required that 10 421 has only two divisors, i.e., itself and 1.
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10 421 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 10 421 is about 102.083.
Thus, the square root of 10 421 is not an integer, and therefore 10 421 is not a square number.
The square of a number (here 10 421) is the result of the product of this number (10 421) by itself (i.e., 10 421 × 10 421); the square of 10 421 is sometimes called "raising 10 421 to the power 2", or "10 421 squared".
The square of 10 421 is 108 597 241 because 10 421 × 10 421 = 10 4212 = 108 597 241.
As a consequence, 10 421 is the square root of 108 597 241.
The multiples of 10 421 are all integers evenly divisible by 10 421, that is all numbers such that the remainder of the division by 10 421 is zero. There are infinitely many multiples of 10 421. The smallest multiples of 10 421 are: