It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 20 003 is not a prime number.
For example, 20 003 can be divided by 83: 20 003 / 83 = 241.
For 20 003 to be a prime number, it would have been required that 20 003 has only two divisors, i.e., itself and 1.
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20 003 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 20 003 is about 141.432.
Thus, the square root of 20 003 is not an integer, and therefore 20 003 is not a square number.
The square of a number (here 20 003) is the result of the product of this number (20 003) by itself (i.e., 20 003 × 20 003); the square of 20 003 is sometimes called "raising 20 003 to the power 2", or "20 003 squared".
The square of 20 003 is 400 120 009 because 20 003 × 20 003 = 20 0032 = 400 120 009.
As a consequence, 20 003 is the square root of 400 120 009.
The multiples of 20 003 are all integers evenly divisible by 20 003, that is all numbers such that the remainder of the division by 20 003 is zero. There are infinitely many multiples of 20 003. The smallest multiples of 20 003 are: