It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 1 378 633 is not a prime number.
For example, 1 378 633 can be divided by 317: 1 378 633 / 317 = 4 349.
For 1 378 633 to be a prime number, it would have been required that 1 378 633 has only two divisors, i.e., itself and 1.
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1 378 633 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 1 378 633 is about 1 174.152.
Thus, the square root of 1 378 633 is not an integer, and therefore 1 378 633 is not a square number.
The square of a number (here 1 378 633) is the result of the product of this number (1 378 633) by itself (i.e., 1 378 633 × 1 378 633); the square of 1 378 633 is sometimes called "raising 1 378 633 to the power 2", or "1 378 633 squared".
The square of 1 378 633 is 1 900 628 948 689 because 1 378 633 × 1 378 633 = 1 378 6332 = 1 900 628 948 689.
As a consequence, 1 378 633 is the square root of 1 900 628 948 689.
The multiples of 1 378 633 are all integers evenly divisible by 1 378 633, that is all numbers such that the remainder of the division by 1 378 633 is zero. There are infinitely many multiples of 1 378 633. The smallest multiples of 1 378 633 are: