All four of them.
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38 isn't ( it's divisible by 2 )
A prime number is defined as a number thats divisible only by 1 and by itself. So you have to check ... Is 38 divisible by 1 ? Yes, it is 38 x 1 = 38 It 38 divisible by itself ? Again, yes : 1 x 38 = 38 Now comes the tricky part .... You have to find out if 38 is divisible by something else than 1 and 38 ... Theres a rule, for example, for numbers divisible by 3 : If the sum of the individual numbers is divisible by 3, the whole number is ... but 11 isn´t divisible by 3, so 38 also isn't. Then, wait .... 38 is an even number, since 37 and 39 aren't. Even numbers are divisible by 2. 38 / 2 = 19 19 is a prime number. 38 isn't.
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Composite, even numbers are divisible by two
38 is divisible by 1, 2, 19, 38.