It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 20 371 is not a prime number.
For example, 20 371 can be divided by 13: 20 371 / 13 = 1 567.
For 20 371 to be a prime number, it would have been required that 20 371 has only two divisors, i.e., itself and 1.
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20 371 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 20 371 is about 142.727.
Thus, the square root of 20 371 is not an integer, and therefore 20 371 is not a square number.
The square of a number (here 20 371) is the result of the product of this number (20 371) by itself (i.e., 20 371 × 20 371); the square of 20 371 is sometimes called "raising 20 371 to the power 2", or "20 371 squared".
The square of 20 371 is 414 977 641 because 20 371 × 20 371 = 20 3712 = 414 977 641.
As a consequence, 20 371 is the square root of 414 977 641.
The multiples of 20 371 are all integers evenly divisible by 20 371, that is all numbers such that the remainder of the division by 20 371 is zero. There are infinitely many multiples of 20 371. The smallest multiples of 20 371 are: